Plain

County ZIP codes · Ohio · FIPS 39159

Union County, OH ZIP Codes

Union County, Ohio has 18 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 17 residential and 1 for PO boxes or a single organization. 8 of the residential ones lie mainly in Union County and 9 mainly in a neighboring county; 13 cross the county line. Median household income ranges from $62,014 in 43060 (North Lewisburg) to $157,568 in 43061 (Ostrander) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Union County?

43007 · Broadway: –43016 · Dublin: $110k43017 · Dublin: $136k43029 · Irwin: $108k43036 · Magnetic Springs: $78k43040 · Marysville: $99k43045 · Milford Center: $99k43060 · North Lewisburg: $62k43061 · Ostrander: $158k43064 · Plain City: $140k43067 · Raymond: $96k43077 · Unionville Center: $105k43084 · Woodstock: $78k43340 · Mount Victory: $72k43342 · Prospect: $85k43344 · Richwood: $81k43358 · West Mansfield: $89k430404306443344433584306743342433404304543061430164306043029430174308443007 · Broadway: –43016 · Dublin: $110k43017 · Dublin: $136k43029 · Irwin: $108k43036 · Magnetic Springs: $78k43040 · Marysville: $99k43045 · Milford Center: $99k43060 · North Lewisburg: $62k43061 · Ostrander: $158k43064 · Plain City: $140k43067 · Raymond: $96k43077 · Unionville Center: $105k43084 · Woodstock: $78k43340 · Mount Victory: $72k43342 · Prospect: $85k43344 · Richwood: $81k43358 · West Mansfield: $89k4304043064433444335843067433424334043045430614301643060430294308443007 · Broadway: –43016 · Dublin: $110k43017 · Dublin: $136k43029 · Irwin: $108k43036 · Magnetic Springs: $78k43040 · Marysville: $99k43045 · Milford Center: $99k43060 · North Lewisburg: $62k43061 · Ostrander: $158k43064 · Plain City: $140k43067 · Raymond: $96k43077 · Unionville Center: $105k43084 · Woodstock: $78k43340 · Mount Victory: $72k43342 · Prospect: $85k43344 · Richwood: $81k43358 · West Mansfield: $89k430404306443344433584306743342433404304543061430164306043029
The residential ZIP codes of Union County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $84,803 and $109,972.

They carry 16 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 17 residential ZIP codes in Union County

8 ZIP codes lie mainly in Union County; 9 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Union County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
43040 Marysville 38,990 234 $99k $311k 99%
43344 Richwood 6,173 63 $81k $238k 94%
43358 West Mansfield 2,275 37 $89k $219k 51%
43067 Raymond 1,884 57 $96k $303k 89%
43045 Milford Center 1,739 46 $99k $275k 93%
43036 Magnetic Springs 359 2,202 $78k $138k 100%
43077 Unionville Center 269 1,703 $105k $183k 100%
43007 Broadway 63 26 – $181k 100%

Partly in Union County

Residential ZIP codes mainly in another county that reach at least 1% into Union County, by their share here
In this county
43064 Plain City 18,143 175 $140k $462k 43%
43029 Irwin 544 23 $108k – 21%
43340 Mount Victory 2,103 43 $72k $193k 20%
43061 Ostrander 4,921 109 $158k $400k 16%
43060 North Lewisburg 2,359 90 $62k $170k 9%
43016 Dublin 46,362 2,440 $110k $452k 8%
43342 Prospect 3,836 90 $85k $176k 7%
43017 Dublin 41,613 2,578 $136k $524k 4%
43084 Woodstock 991 47 $78k $244k 2%

Download the 18 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

14 ZIP codes of Union County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Union County and in the neighboring counties
ZIPIn UnionElsewhere
430168%Franklin County 91%
430174%Franklin County 74%; Delaware County 22%
4304099%
4306443%Madison County 57%
4334494%Delaware County 5%
4306116%Delaware County 84%
433427%Marion County 89%; Delaware County 5%
430609%Champaign County 69%; Logan County 22%
4335851%Logan County 49%
4334020%Hardin County 80%
4306789%Logan County 11%
4304593%Champaign County 7%
430842%Champaign County 98%
4302921%Madison County 79%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Union County without a residential area (GeoNames postal codes)
ZIPPostal name
43041Marysville

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Union County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Union County's ZIP codes use 2 prefixes: 430 and 433.

Three-digit prefixes of Union County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Union County's
PrefixSectional centerHereAll codes
430 Columbus, OH (SCF 430) 14 70
433 Columbus, OH (SCF 430) 4 43

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.