ZIP codes in California by county
California has 1,808 ZIP codes in its 58 counties. 152 of them cross a county line and 6 cross into a neighboring state. Los Angeles County has the most, 301.
By the All Map Tools Team
- ZIP codes
- 1,808
- With 1% or more of their land in the state
- Counties
- 58
- 35 with a page of their own below
- Cross a county line
- 152
- 1% or more of their land in another county
- Cross a state line
- 6
- 1% or more of their land in another state
- County with the most
- 301
- Los Angeles County
- Most populated ZIP
- 92336
- 105,517 people · Fontana
ZIP codes per county in California
- 3–13
- 14–23
- 24–36
- 37–301
Counties and their ZIP codes
| County | Population (2025) | ZIP codes | Shared |
|---|---|---|---|
| Alameda County | 1,636,630 | 53 | 10 |
| Alpine County | 1,043 | 3 | 2 |
| Amador County | 41,876 | 12 | 2 |
| Butte County | 209,211 | 21 | 6 |
| Calaveras County | 46,605 | 21 | 3 |
| Colusa County | 21,836 | 9 | 3 |
| Contra Costa County | 1,170,070 | 48 | 8 |
| Del Norte County | 26,410 | 5 | 0 |
| El Dorado County | 192,323 | 24 | 1 |
| Fresno County | 1,035,456 | 60 | 13 |
| Glenn County | 28,141 | 8 | 2 |
| Humboldt County | 131,647 | 36 | 5 |
| Imperial County | 181,411 | 17 | 2 |
| Inyo County | 18,158 | 13 | 4 |
| Kern County | 927,068 | 53 | 11 |
| Kings County | 154,327 | 13 | 6 |
| Lake County | 67,772 | 15 | 1 |
| Lassen County | 28,117 | 18 | 5 |
| Los Angeles County | 9,694,934 | 301 | 14 |
| Madera County | 167,927 | 17 | 8 |
| Marin County | 253,694 | 29 | 1 |
| Mariposa County | 16,918 | 13 | 8 |
| Mendocino County | 88,122 | 29 | 4 |
| Merced County | 297,260 | 24 | 8 |
| Modoc County | 8,426 | 13 | 5 |
| Mono County | 12,505 | 9 | 2 |
| Monterey County | 433,729 | 33 | 6 |
| Napa County | 132,949 | 13 | 5 |
| Nevada County | 101,911 | 12 | 5 |
| Orange County | 3,149,507 | 90 | 4 |
| Placer County | 442,081 | 33 | 5 |
| Plumas County | 18,583 | 18 | 4 |
| Riverside County | 2,544,916 | 74 | 7 |
| Sacramento County | 1,618,460 | 56 | 6 |
| San Benito County | 70,082 | 7 | 4 |
| San Bernardino County | 2,224,091 | 98 | 10 |
| San Diego County | 3,282,248 | 116 | 3 |
| San Francisco County | 826,079 | 28 | 0 |
| San Joaquin County | 823,815 | 36 | 9 |
| San Luis Obispo County | 282,367 | 28 | 6 |
| San Mateo County | 743,568 | 31 | 2 |
| Santa Barbara County | 442,065 | 25 | 4 |
| Santa Clara County | 1,914,391 | 63 | 6 |
| Santa Cruz County | 258,852 | 17 | 2 |
| Shasta County | 181,648 | 30 | 6 |
| Sierra County | 3,098 | 11 | 5 |
| Siskiyou County | 42,013 | 23 | 3 |
| Solano County | 455,376 | 21 | 9 |
| Sonoma County | 486,444 | 40 | 5 |
| Stanislaus County | 557,719 | 27 | 8 |
| Sutter County | 98,787 | 13 | 6 |
| Tehama County | 64,665 | 17 | 6 |
| Trinity County | 15,720 | 14 | 3 |
| Tulare County | 485,146 | 44 | 11 |
| Tuolumne County | 53,160 | 17 | 5 |
| Ventura County | 830,851 | 34 | 9 |
| Yolo County | 224,410 | 19 | 6 |
| Yuba County | 88,691 | 18 | 10 |
Every ZIP code in California, by county
A ZIP code that crosses a county line appears in each county it has 1% or more of its land in.
- Alameda County (53)
- 94501, 94502, 94505, 94514, 94536, 94538, 94539, 94541, 94542, 94544, 94545, 94546, 94550, 94551, 94552, 94555, 94560, 94566, 94568, 94577, 94578, 94579, 94580, 94586, 94587, 94588, 94601, 94602, 94603, 94605, 94606, 94607, 94608, 94609, 94610, 94611, 94612, 94613, 94618, 94619, 94621, 94702, 94703, 94704, 94705, 94706, 94707, 94708, 94709, 94710, 94720, 95377, 95391
- Alpine County (3)
- 95223, 95646, 96120
- Amador County (12)
- 95601, 95629, 95640, 95642, 95646, 95665, 95666, 95669, 95675, 95685, 95689, 95699
- Butte County (21)
- 95901, 95914, 95916, 95917, 95926, 95928, 95929, 95930, 95938, 95941, 95942, 95948, 95954, 95958, 95965, 95966, 95968, 95969, 95973, 95974, 95978
- Calaveras County (21)
- 95221, 95222, 95223, 95224, 95225, 95226, 95228, 95230, 95232, 95233, 95236, 95245, 95246, 95247, 95248, 95249, 95251, 95252, 95254, 95255, 95257
- Colusa County (9)
- 95645, 95912, 95932, 95950, 95955, 95957, 95970, 95979, 95987
- Contra Costa County (48)
- 94505, 94506, 94507, 94509, 94511, 94513, 94514, 94516, 94517, 94518, 94519, 94520, 94521, 94523, 94525, 94526, 94528, 94530, 94531, 94547, 94548, 94549, 94551, 94553, 94556, 94561, 94563, 94564, 94565, 94569, 94572, 94575, 94582, 94583, 94588, 94595, 94596, 94597, 94598, 94611, 94707, 94708, 94801, 94803, 94804, 94805, 94806, 95219
- Del Norte County (5)
- 95531, 95538, 95543, 95548, 95567
- El Dorado County (24)
- 95613, 95614, 95619, 95623, 95629, 95633, 95634, 95635, 95636, 95651, 95664, 95667, 95672, 95682, 95684, 95709, 95720, 95721, 95726, 95735, 95762, 96142, 96150, 96155
- Fresno County (60)
- 93210, 93234, 93242, 93602, 93605, 93606, 93608, 93609, 93611, 93612, 93616, 93618, 93619, 93620, 93621, 93622, 93624, 93625, 93626, 93627, 93628, 93630, 93631, 93634, 93640, 93641, 93646, 93648, 93650, 93651, 93652, 93654, 93656, 93657, 93660, 93662, 93664, 93667, 93668, 93675, 93701, 93702, 93703, 93704, 93705, 93706, 93710, 93711, 93720, 93721, 93722, 93723, 93725, 93726, 93727, 93728, 93730, 93737, 93740, 93741
- Glenn County (8)
- 95913, 95920, 95939, 95943, 95951, 95963, 95970, 95988
- Humboldt County (36)
- 95501, 95503, 95511, 95514, 95519, 95521, 95524, 95525, 95526, 95528, 95536, 95537, 95540, 95542, 95545, 95546, 95547, 95549, 95550, 95551, 95552, 95553, 95554, 95555, 95556, 95558, 95559, 95560, 95562, 95564, 95565, 95569, 95570, 95571, 95573, 95589
- Imperial County (17)
- 92004, 92222, 92227, 92231, 92233, 92243, 92249, 92250, 92251, 92257, 92259, 92266, 92273, 92274, 92275, 92281, 92283
- Inyo County (13)
- 89060, 89061, 92328, 92384, 92389, 93513, 93514, 93522, 93526, 93527, 93530, 93545, 93549
- Kern County (53)
- 93203, 93205, 93206, 93215, 93220, 93222, 93224, 93225, 93226, 93238, 93240, 93241, 93243, 93249, 93250, 93251, 93252, 93255, 93263, 93268, 93276, 93280, 93283, 93285, 93287, 93301, 93304, 93305, 93306, 93307, 93308, 93309, 93311, 93312, 93313, 93314, 93461, 93501, 93505, 93516, 93518, 93519, 93523, 93524, 93527, 93528, 93531, 93536, 93554, 93555, 93560, 93561, 93581
- Kings County (13)
- 93201, 93202, 93204, 93212, 93230, 93239, 93242, 93245, 93246, 93266, 93274, 93631, 93656
- Lake County (15)
- 95422, 95423, 95426, 95435, 95443, 95451, 95453, 95457, 95458, 95461, 95464, 95467, 95469, 95485, 95493
- Lassen County (18)
- 96006, 96009, 96056, 96068, 96105, 96109, 96110, 96113, 96114, 96117, 96119, 96121, 96123, 96128, 96130, 96132, 96136, 96137
- Los Angeles County (301)
- 90001, 90002, 90003, 90004, 90005, 90006, 90007, 90008, 90010, 90011, 90012, 90013, 90014, 90015, 90016, 90017, 90018, 90019, 90020, 90021, 90022, 90023, 90024, 90025, 90026, 90027, 90028, 90029, 90031, 90032, 90033, 90034, 90035, 90036, 90037, 90038, 90039, 90040, 90041, 90042, 90043, 90044, 90045, 90046, 90047, 90048, 90049, 90052, 90056, 90057, 90058, 90059, 90061, 90062, 90063, 90064, 90065, 90066, 90067, 90068, 90069, 90071, 90073, 90077, 90079, 90089, 90094, 90095, 90201, 90210, 90211, 90212, 90220, 90221, 90222, 90230, 90232, 90240, 90241, 90242, 90245, 90247, 90248, 90249, 90250, 90254, 90255, 90260, 90262, 90263, 90265, 90266, 90270, 90272, 90274, 90275, 90277, 90278, 90280, 90290, 90291, 90292, 90293, 90301, 90302, 90303, 90304, 90305, 90401, 90402, 90403, 90404, 90405, 90501, 90502, 90503, 90504, 90505, 90506, 90601, 90602, 90603, 90604, 90605, 90606, 90623, 90631, 90638, 90639, 90640, 90650, 90660, 90670, 90701, 90703, 90704, 90706, 90710, 90712, 90713, 90715, 90716, 90717, 90723, 90731, 90732, 90744, 90745, 90746, 90747, 90755, 90802, 90803, 90804, 90805, 90806, 90807, 90808, 90810, 90813, 90814, 90815, 90822, 90831, 90840, 91001, 91006, 91007, 91008, 91010, 91011, 91016, 91020, 91024, 91030, 91040, 91042, 91046, 91101, 91103, 91104, 91105, 91106, 91107, 91108, 91125, 91201, 91202, 91203, 91204, 91205, 91206, 91207, 91208, 91210, 91214, 91301, 91302, 91303, 91304, 91306, 91307, 91311, 91316, 91321, 91324, 91325, 91326, 91330, 91331, 91335, 91340, 91342, 91343, 91344, 91345, 91350, 91351, 91352, 91354, 91355, 91356, 91361, 91362, 91364, 91367, 91371, 91381, 91384, 91387, 91390, 91401, 91402, 91403, 91405, 91406, 91411, 91423, 91436, 91501, 91502, 91504, 91505, 91506, 91601, 91602, 91604, 91605, 91606, 91607, 91608, 91702, 91706, 91711, 91722, 91723, 91724, 91731, 91732, 91733, 91740, 91741, 91744, 91745, 91746, 91748, 91750, 91754, 91755, 91759, 91765, 91766, 91767, 91768, 91770, 91773, 91775, 91776, 91780, 91789, 91790, 91791, 91792, 91801, 91803, 92397, 93243, 93510, 93532, 93534, 93535, 93536, 93543, 93544, 93550, 93551, 93552, 93553, 93560, 93563, 93591
- Madera County (17)
- 93601, 93602, 93604, 93610, 93614, 93622, 93623, 93626, 93636, 93637, 93638, 93643, 93644, 93645, 93653, 93669, 93720
- Marin County (29)
- 94901, 94903, 94904, 94920, 94924, 94925, 94929, 94930, 94933, 94937, 94938, 94939, 94940, 94941, 94945, 94946, 94947, 94949, 94950, 94952, 94956, 94957, 94960, 94963, 94964, 94965, 94970, 94971, 94973
- Mariposa County (13)
- 93601, 93623, 93653, 95306, 95311, 95318, 95321, 95325, 95329, 95338, 95345, 95369, 95389
- Mendocino County (29)
- 95410, 95415, 95417, 95420, 95425, 95427, 95428, 95429, 95432, 95437, 95445, 95449, 95454, 95456, 95459, 95460, 95463, 95466, 95468, 95469, 95470, 95482, 95488, 95490, 95494, 95542, 95585, 95587, 95589
- Merced County (24)
- 93610, 93620, 93622, 93635, 93665, 95301, 95303, 95312, 95315, 95316, 95317, 95322, 95324, 95333, 95334, 95340, 95341, 95348, 95360, 95365, 95369, 95374, 95380, 95388
- Modoc County (13)
- 96006, 96015, 96054, 96056, 96101, 96104, 96108, 96110, 96112, 96115, 96116, 96134, 97635
- Mono County (9)
- 89010, 93512, 93514, 93517, 93529, 93541, 93546, 96107, 96133
- Monterey County (33)
- 93210, 93426, 93450, 93451, 93901, 93905, 93906, 93907, 93908, 93920, 93921, 93923, 93924, 93925, 93926, 93927, 93928, 93930, 93932, 93933, 93940, 93943, 93944, 93950, 93953, 93954, 93955, 93960, 93962, 95004, 95012, 95039, 95076
- Napa County (13)
- 94503, 94508, 94515, 94558, 94559, 94562, 94567, 94573, 94574, 94576, 94591, 94599, 95476
- Nevada County (12)
- 95602, 95728, 95945, 95946, 95949, 95959, 95960, 95975, 95977, 95986, 96111, 96161
- Orange County (90)
- 90620, 90621, 90623, 90630, 90631, 90680, 90720, 90740, 90742, 90743, 92530, 92602, 92603, 92604, 92606, 92610, 92612, 92614, 92617, 92618, 92620, 92624, 92625, 92626, 92627, 92629, 92630, 92637, 92646, 92647, 92648, 92649, 92651, 92653, 92655, 92656, 92657, 92660, 92661, 92662, 92663, 92672, 92673, 92675, 92676, 92677, 92678, 92679, 92683, 92688, 92691, 92692, 92694, 92697, 92701, 92703, 92704, 92705, 92706, 92707, 92708, 92780, 92782, 92801, 92802, 92804, 92805, 92806, 92807, 92808, 92821, 92823, 92831, 92832, 92833, 92835, 92840, 92841, 92843, 92844, 92845, 92861, 92865, 92866, 92867, 92868, 92869, 92870, 92886, 92887
- Placer County (33)
- 95602, 95603, 95604, 95626, 95631, 95648, 95650, 95658, 95661, 95663, 95668, 95677, 95678, 95681, 95701, 95703, 95713, 95714, 95715, 95717, 95722, 95728, 95736, 95746, 95747, 95765, 96140, 96141, 96143, 96145, 96146, 96148, 96161
- Plumas County (18)
- 95915, 95923, 95934, 95947, 95956, 95971, 95981, 95983, 95984, 96020, 96103, 96105, 96106, 96118, 96122, 96129, 96135, 96137
- Riverside County (74)
- 91752, 92201, 92203, 92210, 92211, 92220, 92223, 92225, 92230, 92234, 92236, 92239, 92240, 92241, 92253, 92254, 92258, 92260, 92262, 92264, 92270, 92274, 92276, 92277, 92282, 92320, 92324, 92373, 92501, 92503, 92504, 92505, 92506, 92507, 92508, 92509, 92518, 92521, 92530, 92532, 92536, 92539, 92543, 92544, 92545, 92548, 92549, 92551, 92553, 92555, 92557, 92561, 92562, 92563, 92567, 92570, 92571, 92582, 92583, 92584, 92585, 92586, 92587, 92590, 92591, 92592, 92595, 92596, 92860, 92879, 92880, 92881, 92882, 92883
- Sacramento County (56)
- 94571, 95608, 95610, 95615, 95621, 95624, 95626, 95628, 95630, 95632, 95638, 95639, 95641, 95652, 95655, 95660, 95662, 95670, 95671, 95673, 95680, 95683, 95690, 95693, 95742, 95757, 95758, 95811, 95814, 95815, 95816, 95817, 95818, 95819, 95820, 95821, 95822, 95823, 95824, 95825, 95826, 95827, 95828, 95829, 95830, 95831, 95832, 95833, 95834, 95835, 95837, 95838, 95841, 95842, 95843, 95864
- San Benito County (7)
- 93210, 93930, 95004, 95023, 95043, 95045, 95075
- San Bernardino County (98)
- 89019, 91701, 91708, 91709, 91710, 91730, 91737, 91739, 91759, 91761, 91762, 91763, 91764, 91766, 91784, 91786, 92242, 92252, 92256, 92267, 92268, 92277, 92278, 92280, 92284, 92285, 92301, 92304, 92305, 92307, 92308, 92309, 92310, 92311, 92313, 92314, 92315, 92316, 92317, 92321, 92322, 92324, 92325, 92327, 92332, 92333, 92335, 92336, 92337, 92338, 92339, 92341, 92342, 92344, 92345, 92346, 92347, 92350, 92352, 92354, 92356, 92358, 92359, 92363, 92364, 92365, 92368, 92369, 92371, 92372, 92373, 92374, 92376, 92377, 92378, 92382, 92385, 92386, 92391, 92392, 92394, 92395, 92397, 92398, 92399, 92401, 92404, 92405, 92407, 92408, 92410, 92411, 92415, 92880, 93516, 93555, 93558, 93562
- San Diego County (116)
- 91901, 91902, 91905, 91906, 91910, 91911, 91913, 91914, 91915, 91916, 91917, 91931, 91932, 91934, 91935, 91941, 91942, 91945, 91948, 91950, 91962, 91963, 91977, 91978, 91980, 92003, 92004, 92007, 92008, 92009, 92010, 92011, 92014, 92019, 92020, 92021, 92024, 92025, 92026, 92027, 92028, 92029, 92036, 92037, 92040, 92054, 92055, 92056, 92057, 92058, 92059, 92060, 92061, 92064, 92065, 92066, 92067, 92069, 92070, 92071, 92075, 92078, 92081, 92082, 92083, 92084, 92086, 92091, 92092, 92093, 92096, 92101, 92102, 92103, 92104, 92105, 92106, 92107, 92108, 92109, 92110, 92111, 92113, 92114, 92115, 92116, 92117, 92118, 92119, 92120, 92121, 92122, 92123, 92124, 92126, 92127, 92128, 92129, 92130, 92131, 92132, 92134, 92135, 92136, 92139, 92140, 92145, 92147, 92154, 92155, 92161, 92173, 92179, 92182, 92562, 92672
- San Francisco County (28)
- 94102, 94103, 94104, 94105, 94107, 94108, 94109, 94110, 94111, 94112, 94114, 94115, 94116, 94117, 94118, 94121, 94122, 94123, 94124, 94127, 94129, 94130, 94131, 94132, 94133, 94134, 94158, 94188
- San Joaquin County (36)
- 95202, 95203, 95204, 95205, 95206, 95207, 95209, 95210, 95211, 95212, 95215, 95219, 95220, 95227, 95230, 95231, 95236, 95237, 95240, 95242, 95253, 95258, 95304, 95320, 95330, 95336, 95337, 95361, 95366, 95376, 95377, 95385, 95391, 95632, 95641, 95686
- San Luis Obispo County (28)
- 93252, 93254, 93401, 93402, 93405, 93407, 93408, 93409, 93410, 93420, 93422, 93424, 93426, 93428, 93430, 93432, 93433, 93442, 93444, 93445, 93446, 93449, 93451, 93452, 93453, 93454, 93461, 93465
- San Mateo County (31)
- 94002, 94005, 94010, 94014, 94015, 94018, 94019, 94020, 94021, 94025, 94027, 94028, 94030, 94037, 94038, 94044, 94060, 94061, 94062, 94063, 94065, 94066, 94070, 94074, 94080, 94128, 94303, 94401, 94402, 94403, 94404
- Santa Barbara County (25)
- 93013, 93067, 93101, 93103, 93105, 93106, 93108, 93109, 93110, 93111, 93117, 93252, 93254, 93427, 93429, 93434, 93436, 93437, 93440, 93441, 93454, 93455, 93458, 93460, 93463
- Santa Clara County (63)
- 94022, 94024, 94028, 94040, 94041, 94043, 94085, 94086, 94087, 94089, 94301, 94303, 94304, 94305, 94306, 94550, 95002, 95008, 95013, 95014, 95020, 95023, 95030, 95032, 95033, 95035, 95037, 95046, 95050, 95051, 95053, 95054, 95070, 95076, 95110, 95111, 95112, 95113, 95116, 95117, 95118, 95119, 95120, 95121, 95122, 95123, 95124, 95125, 95126, 95127, 95128, 95129, 95130, 95131, 95132, 95133, 95134, 95135, 95136, 95138, 95139, 95140, 95148
- Santa Cruz County (17)
- 95003, 95005, 95006, 95007, 95010, 95017, 95018, 95019, 95033, 95041, 95060, 95062, 95064, 95065, 95066, 95073, 95076
- Shasta County (30)
- 96001, 96002, 96003, 96007, 96008, 96011, 96013, 96016, 96017, 96019, 96022, 96025, 96028, 96033, 96040, 96047, 96051, 96056, 96059, 96062, 96065, 96069, 96071, 96073, 96075, 96076, 96084, 96087, 96088, 96096
- Sierra County (11)
- 89439, 95910, 95922, 95936, 95944, 95960, 96105, 96118, 96124, 96125, 96126
- Siskiyou County (23)
- 95556, 95568, 96014, 96023, 96025, 96027, 96031, 96032, 96034, 96037, 96038, 96039, 96044, 96050, 96057, 96058, 96064, 96067, 96085, 96086, 96094, 96097, 96134
- Solano County (21)
- 94503, 94510, 94512, 94533, 94534, 94535, 94571, 94585, 94589, 94590, 94591, 94592, 95612, 95616, 95618, 95620, 95625, 95687, 95688, 95690, 95694
- Sonoma County (40)
- 94515, 94574, 94922, 94923, 94928, 94931, 94951, 94952, 94954, 94972, 95401, 95403, 95404, 95405, 95407, 95409, 95412, 95419, 95421, 95425, 95430, 95431, 95436, 95439, 95441, 95442, 95444, 95446, 95448, 95450, 95452, 95462, 95465, 95471, 95472, 95476, 95480, 95486, 95492, 95497
- Stanislaus County (27)
- 95230, 95307, 95313, 95316, 95319, 95322, 95323, 95326, 95328, 95329, 95350, 95351, 95354, 95355, 95356, 95357, 95358, 95360, 95361, 95363, 95367, 95368, 95380, 95382, 95385, 95386, 95387
- Sutter County (13)
- 95626, 95645, 95659, 95668, 95674, 95676, 95692, 95837, 95953, 95957, 95982, 95991, 95993
- Tehama County (17)
- 95963, 95973, 96021, 96022, 96029, 96035, 96055, 96059, 96061, 96063, 96074, 96075, 96076, 96078, 96080, 96090, 96092
- Trinity County (14)
- 95526, 95527, 95552, 95563, 95595, 96010, 96024, 96041, 96046, 96048, 96052, 96076, 96091, 96093
- Tulare County (44)
- 93201, 93207, 93208, 93212, 93215, 93218, 93219, 93221, 93223, 93227, 93235, 93237, 93238, 93244, 93247, 93256, 93257, 93258, 93260, 93261, 93262, 93265, 93267, 93270, 93271, 93272, 93274, 93277, 93286, 93291, 93292, 93527, 93603, 93615, 93618, 93631, 93633, 93641, 93646, 93647, 93654, 93666, 93670, 93673
- Tuolumne County (17)
- 95223, 95305, 95309, 95310, 95311, 95321, 95327, 95329, 95335, 95346, 95364, 95370, 95372, 95375, 95379, 95383, 95389
- Ventura County (34)
- 90265, 91304, 91307, 91311, 91320, 91360, 91361, 91362, 91377, 93001, 93003, 93004, 93010, 93012, 93013, 93015, 93021, 93022, 93023, 93030, 93033, 93035, 93036, 93040, 93041, 93042, 93043, 93060, 93063, 93064, 93065, 93066, 93225, 93252
- Yolo County (19)
- 95605, 95606, 95607, 95612, 95616, 95618, 95620, 95627, 95637, 95645, 95653, 95679, 95691, 95694, 95695, 95697, 95698, 95776, 95937
- Yuba County (18)
- 95692, 95901, 95903, 95914, 95918, 95919, 95922, 95925, 95930, 95935, 95941, 95960, 95961, 95962, 95966, 95972, 95977, 95981
Neighboring states
Tools for California
Sources
- U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
- U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
- U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
- U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.
How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.
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