ZIP codes

ZIP codes in Sangamon County, Illinois

Sangamon County has 30 ZIP codes. 19 lie entirely inside it and 11 are shared with neighboring counties, so part of their land and their people are elsewhere. About 194,964 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 30; With 1% or more of their land inside
Entirely inside: 19; 99% or more of their land
Shared with other counties: 11; Most with Christian County (3)
Most populated ZIP: 62704; 40,046 people · Springfield
Least populated ZIP: 62689; 542 people · Thayer; 1 more with nobody living there
Largest ZIP by land: 62558; 94 sq mi · Pawnee

Map of the ZIP codes in Sangamon County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Sangamon County

30 ZIP codes in Sangamon County, IL, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
62515	Buffalo	902	100%	902
62520	Dawson	1,652	100%	1,652
62530	Divernon	1,558	100%	1,558
62536	Chatham	1,049	100%	1,049
62539	Illiopolis	1,412	77%	≈ 1,095
62545	Mechanicsburg	1,101	65%	≈ 865
62548	Mount Pulaski	2,090	1.3%	≈ 36
62558	Pawnee	3,639	53%	≈ 2,914
62561	Riverton	4,842	100%	4,842
62563	Rochester	5,766	96%	≈ 5,721
62613	Athens	3,598	7.3%	≈ 478
62615	Auburn	5,198	100%	5,198
62625	Cantrall	1,003	100%	1,003
62629	Chatham	15,413	100%	15,413
62661	Loami	1,212	100%	1,212
62670	Curran	2,682	92%	≈ 2,587
62677	Pleasant Plains	2,149	98%	≈ 2,134
62684	Sherman	5,760	100%	5,760
62689	Thayer	542	100%	542
62690	Virden	3,838	16%	≈ 448
62692	Waverly	2,005	48%	≈ 833
62693	Williamsville	1,677	61%	≈ 1,440
62701	Springfield	1,205	100%	1,205
62702	Springfield	31,033	100%	31,033
62703	Springfield	28,922	100%	28,922
62704	Springfield	40,046	100%	40,046
62706	Springfield	0	100%	0
62707	Springfield	7,472	100%	7,472
62711	Springfield	18,559	100%	18,559
62712	Springfield	10,045	100%	10,045

ZIP codes shared with other counties

These 11 ZIP codes have part of their land in another county. The first figure is the share of their land in Sangamon County; then, where the rest lies.

62539 (Illiopolis): 77% here; 23% in Macon County.
62545 (Mechanicsburg): 65% here; 35% in Christian County.
62548 (Mount Pulaski): 1.3% here; 99% in Logan County.
62558 (Pawnee): 53% here; 38% in Christian County and 9.2% in Montgomery County.
62563 (Rochester): 96% here; 4.2% in Christian County.
62613 (Athens): 7.3% here; 85% in Menard County and 7.3% in Logan County.
62670 (Curran): 92% here; 7.9% in Morgan County.
62677 (Pleasant Plains): 98% here; 1.7% in Menard County.
62690 (Virden): 16% here; 63% in Macoupin County and 21% in Montgomery County.
62692 (Waverly): 48% here; 52% in Morgan County.
62693 (Williamsville): 61% here; 37% in Logan County and 2.9% in Menard County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Springfield (8), Chatham (2), Athens (1), Auburn (1), Buffalo (1), and Cantrall (1); 22 places in all.

They start with 3 different three-digit prefixes, one per USPS sorting center: 625, 626, and 627.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

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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