ZIP Codes of Otter Tail County, MN

Population & People
Population & People
Total Population
56,440
Household Income
Household Income
Median Income
$74,615
Housing
Housing
Total Housing Units
34,474
Business & Economy
Business & Economy
Total Businesses
1,682
Employment
Employment
Employment Rate
57.32%
Education
Education
Bachelor's Degree+
28.27%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 20 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:20 ZIP Codes (19 Standard, 1 PO Box, 0 Unique) [See All]
Area Codes:218 / 320
Timezone:Central (GMT -06:00)
Local Time:11:53:56 PM
Population:56,440 [See All]
FIPS:27111
CBSA:Fergus Falls, MN
Land Area:1,911 sq mi
Water Area:235 sq mi
Coordinates:46.3914, -95.7087
Quick Link:
https://www.zip-codes.com/county/mn-otter-tail.asp
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Minnesota's #18 most populous county
56,440 residents across 20 ZIPs — #18 of 93 Minnesota counties.

Standout ZIPs in this County


Most Populous
Fergus Falls · 19,856 people
35.2% of county total
Highest Income
Clitherall · $95,938 median
1.3× county average
Largest Land Area
Fergus Falls · 305.5 sq mi
Spans the most ground
Fastest Growth
Perham · 13.9% (10-yr)
6,338 → 7,221 residents
Most Educated
Battle Lake · 34.8% bachelor's+
799 of 2,296 adults 25+

Things worth knowing about Otter Tail County


56,440 residents live across 20 ZIPs covering 1,911 sq mi, served by 19 distinct USPS-recognized cities.

Population moved from 53,820 to 56,440 from 2014 to 2024 — a +4.9% change. 12 ZIPs gained residents, 7 lost.

The county's wealthiest ZIP 56524 (Clitherall, $95,938 median) and poorest ZIP 56551 (Henning, $63,750) are 10.5 miles apart — a 1.5× income gap across local geography.

Median home values vary 2.5× across this county — from $160,300 in 56518 (Bluffton) to $398,500 in 56515 (Battle Lake).

Density varies across the county — from 9 people/sq mi in 56588 (Vining) to 65 in 56537 (Fergus Falls).

Educational attainment ranges from 11.2% bachelor's+ in 56361 (Parkers Prairie) to 38.7% in 56524 (Clitherall) — the breadth of educational profiles across the area.

Within Minnesota, this is the #18 most populous of 93 counties and ranks #53 for median household income .

Weighted by population, the typical household earns about $71,252 across the county — reflecting what a typical resident sees, not a simple ZIP average.

28.3% of adults age 25+ hold a bachelor's degree or higher (11,540 of 40,824 reporting).

19 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Otter Tail 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
1,911
square miles
Avg density
29.5
people per sq mi
Population
56,440
across 20 ZIPs
Fergus Falls
305.5 sq mi
19,856 residents
Pelican Rapids
192.4 sq mi
5,827 residents
Parkers Prairie
166.1 sq mi
2,592 residents

All ZIP Codes in Otter Tail County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
56537Fergus FallsStandard19,856$65,473305.56.3%
56573PerhamStandard7,221$68,770153.313.9%
56572Pelican RapidsStandard5,827$79,475192.413.2%
56567New York MillsStandard3,367$72,500151.7-3.3%
56515Battle LakeStandard2,723$73,750134.2-12.5%
56361Parkers PrairieStandard2,592$70,541166.19.0%
56551HenningStandard2,387$63,750111.56.4%
56586UnderwoodStandard1,873$79,58387.60.5%
56571OttertailStandard1,745$85,86565.53.6%
56528DentStandard1,623$79,50084.51.2%
56587VergasStandard1,339$88,00070.0-4.2%
56534ErhardStandard1,201$70,69468.8-1.2%
56324DaltonStandard1,028$82,91770.8-17.8%
56527Deer CreekStandard881$64,37553.913.8%
56576RichvilleStandard820$63,75055.018.5%
56524ClitherallStandard694$95,93854.5-7.6%
56518BlufftonStandard494$71,25018.643.2%
56588ViningStandard483$74,30651.4-17.0%
56533ElizabethStandard286$67,25015.41.1%
56538Fergus FallsPO Box0.0

Adjacent & Nearby Counties