Allen County, Ohio ZIP codes
14 ZIP codes are in Allen County, plus 7 that cross in from neighboring counties. It's part of the Lima, OH metro area.
- ZIP codes
- 14
- Population in these ZIPs
- 108,577
- Avg. median income
- $64,600population-weighted
- Cities & towns
- 9
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Allen County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 45801 | Lima | 21,739 | $51,731 | $141,500 |
| 45802 PO Box | Lima | — | — | — |
| 45804 | Lima | 13,608 | $44,911 | $74,600 |
| 45805 | Lima | 24,387 | $68,842 | $194,200 |
| 45806 | Lima | 10,974 | $82,587 | $237,300 |
| 45807 | Lima | 11,774 | $70,725 | $257,800 |
| 45808 | Beaverdam | 350 | $81,875 | $122,200 |
| 45809 | Gomer | 45 | — | $154,200 |
| 45817 | Bluffton | 5,926 | $76,848 | $274,600 |
| 45820 | Cairo | 581 | $83,125 | $142,700 |
| 45833 | Delphos | 10,919 | $65,000 | $198,700 |
| 45850 | Harrod | 3,559 | $84,886 | $241,400 |
| 45854 | Lafayette | 293 | $53,125 | $121,300 |
| 45887 | Spencerville | 4,422 | $68,409 | $202,600 |
ZIP codes partly in Allen County
These ZIP codes are mostly in a neighboring county but cover part of Allen County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 45810 | Ada | Hardin County | 7,449 | $63,451 | $232,000 |
| 45812 | Alger | Hardin County | 2,027 | $44,045 | $163,400 |
| 45830 | Columbus Grove | Putnam County | 5,199 | $80,897 | $245,100 |
| 45844 | Fort Jennings | Putnam County | 3,059 | $88,792 | $298,200 |
| 45877 | Pandora | Putnam County | 2,562 | $68,665 | $242,400 |
| 45895 | Wapakoneta | Auglaize County | 17,998 | $74,783 | $242,800 |
| 45896 | Waynesfield | Auglaize County | 1,833 | $62,449 | $212,000 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Allen County
Nearby counties
Frequently asked questions
How many ZIP codes are in Allen County, Ohio?
14 ZIP codes are mainly in Allen County, and 7 more ZIP codes from neighboring areas reach partly into it.
What cities are in Allen County?
ZIP codes in Allen County use the city names Beaverdam, Bluffton, Cairo, Delphos, Gomer, Harrod, Lafayette, Lima and Spencerville.
What metro area is Allen County in?
Allen County is part of the Lima, OH metropolitan statistical area.