ZIP codes

ZIP codes in Warren County, Ohio

Warren County has 21 ZIP codes. 9 lie entirely inside it and 12 are shared with neighboring counties, so part of their land and their people are elsewhere. About 253,356 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 21; 3 more just touch the border (under 1% of their land)
Entirely inside: 9; 99% or more of their land
Shared with other counties: 12; Most with Clermont County (4)
Most populated ZIP: 45040; 59,518 people · Mason
Least populated ZIP: 45032; 683 people · Harveysburg
Largest ZIP by land: 45036; 81 sq mi · Lebanon

Map of the ZIP codes in Warren 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 Warren County

21 ZIP codes in Warren County, OH, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
45005	Franklin	32,251	99.3%	≈ 32,217
45032	Harveysburg	683	100%	683
45034	Kings Mills	968	100%	968
45036	Lebanon	42,204	100%	42,204
45039	Landen	28,335	100%	28,335
45040	Mason	59,518	100%	59,518
45044	Middletown	56,217	8.0%	≈ 1,320
45050	Monroe	12,248	17%	≈ 659
45054	—	2,693	100%	2,693
45065	South Lebanon	7,053	100%	7,053
45066	Springboro	27,545	99%	≈ 27,024
45068	Waynesville	11,597	88%	≈ 11,001
45107	Blanchester	9,190	19%	≈ 1,375
45113	Clarksville	3,877	42%	≈ 1,557
45122	Goshen	10,977	10%	≈ 765
45140	Loveland	57,211	31%	≈ 11,459
45152	Morrow	14,850	100%	14,850
45162	Pleasant Plain	2,754	65%	≈ 1,698
45249	Montgomery	14,490	7.7%	≈ 1,647
45342	Miamisburg	36,152	1.6%	≈ 737
45458	Centerville	38,712	16%	≈ 5,148

They also touch the county with under 1% of their land, so they aren’t counted: 45042, 45241, and 45327.

ZIP codes shared with other counties

These 12 ZIP codes have part of their land in another county. The first figure is the share of their land in Warren County; then, where the rest lies.

45044 (Middletown): 8.0% here; 92% in Butler County.
45050 (Monroe): 17% here; 83% in Butler County.
45066 (Springboro): 99% here; 1.0% in Montgomery County.
45068 (Waynesville): 88% here; 9.9% in Greene County and 2.0% in Clinton County.
45107 (Blanchester): 19% here; 52% in Clinton County, 18% in Brown County, and 11% in Clermont County.
45113 (Clarksville): 42% here; 58% in Clinton County.
45122 (Goshen): 10% here; 90% in Clermont County.
45140 (Loveland): 31% here; 53% in Clermont County and 15% in Hamilton County.
45162 (Pleasant Plain): 65% here; 35% in Clermont County.
45249 (Montgomery): 7.7% here; 92% in Hamilton County.
45342 (Miamisburg): 1.6% here; 98% in Montgomery County.
45458 (Centerville): 16% here; 82% in Montgomery County and 2.1% in Greene 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 Blanchester (1), Centerville (1), Clarksville (1), Franklin (1), Goshen (1), and Harveysburg (1); 20 places in all.

They start with 5 different three-digit prefixes, one per USPS sorting center: 450, 451, 452, 453, and 454.

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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