ZIP Codes of Seneca County, OH

Population & People
Population & People
Total Population
59,464
Household Income
Household Income
Median Income
$72,724
Housing
Housing
Total Housing Units
26,393
Business & Economy
Business & Economy
Total Businesses
1,150
Employment
Employment
Employment Rate
59.17%
Education
Education
Bachelor's Degree+
20.04%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 13 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:13 ZIP Codes (9 Standard, 4 PO Box, 0 Unique) [See All]
Area Codes:419 / 567
Timezone:Eastern (GMT -05:00)
Local Time:11:54:41 PM
Population:59,464 [See All]
FIPS:39147
CBSA:Tiffin, OH
Land Area:603 sq mi
Water Area:2 sq mi
Coordinates:41.1506, -83.1624
Quick Link:
https://www.zip-codes.com/county/oh-seneca.asp
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Ohio's #43 most populous county
59,464 residents across 13 ZIPs — #43 of 88 Ohio counties.

Standout ZIPs in this County


Most Populous
Tiffin · 28,102 people
47.3% of county total
Highest Income
New Riegel · $90,281 median
1.2× county average
Largest Land Area
Tiffin · 163.6 sq mi
Spans the most ground
Fastest Growth
New Riegel · 10.7% (10-yr)
1,256 → 1,391 residents
Most Educated
Tiffin · 26.4% bachelor's+
5,005 of 18,980 adults 25+

Things worth knowing about Seneca County


59,464 residents live across 13 ZIPs covering 603 sq mi, served by 13 distinct USPS-recognized cities.

Population moved from 60,997 to 59,464 from 2014 to 2024 — a -2.5% change. 6 ZIPs gained residents, 7 lost.

The county's wealthiest ZIP 44853 (New Riegel, $90,281 median) and poorest ZIP 44841 (Kansas, $53,295) are 13.0 miles apart — a 1.7× income gap across local geography.

Median home values vary 1.7× across this county — from $112,800 in 44815 (Bettsville) to $197,100 in 44802 (Alvada).

Density varies 44× across the county — from 26 people/sq mi in 44818 (Bloomville) to 1,132 in 44815 (Bettsville).

Educational attainment ranges from 12.2% bachelor's+ in 44830 (Fostoria) to 26.4% in 44883 (Tiffin) — the breadth of educational profiles across the area.

Within Ohio, this is the #43 most populous of 88 counties and ranks #40 for median household income .

Weighted by population, the typical household earns about $65,791 across the county — reflecting what a typical resident sees, not a simple ZIP average.

20.0% of adults age 25+ hold a bachelor's degree or higher (8,130 of 40,578 reporting).

9 Standard delivery, 4 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Seneca County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
603
square miles
Avg density
98.6
people per sq mi
Population
59,464
across 13 ZIPs
Tiffin
163.6 sq mi
28,102 residents
Fostoria
119.8 sq mi
18,671 residents
Bloomville
78.0 sq mi
1,989 residents

All ZIP Codes in Seneca County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
44883TiffinStandard28,102$62,692163.6-4.0%
44830FostoriaStandard18,671$62,990119.80.8%
44836Green SpringsStandard2,496$79,29935.60.8%
44867RepublicStandard2,345$72,71659.1-8.9%
44807AtticaStandard2,244$87,35671.73.5%
44818BloomvilleStandard1,989$63,92278.0-13.1%
44853New RiegelStandard1,391$90,28127.610.7%
44802AlvadaStandard746$80,00027.2-15.8%
44815BettsvillePO Box710$74,6880.616.8%
44841KansasStandard498$53,29519.2-18.9%
44828Flat RockPO Box1380.1411.1%
44809BascomPO Box1030.4-59.4%
44861Old FortPO Box310.2-36.7%

Adjacent & Nearby Counties