Spencer, IA 51301 ZIP Code Profile

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Spencer, IA

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ZIP Code 51301: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Spencer, IA 51301

  • ZIP Code Type: STANDARD
  • County: Clay County
  • Centroid: Latitude 43.145, Longitude -95.144
  • Time Zone: Central Time Zone (UTC -6 hours)
  • Observes DST: Yes
  • Businesses Addresses: 726
  • PO Box Addresses: 247
  • Residential Addresses: 5,806
    • Multi-Family Addresses: 761
    • Single Family Addresses: 5,045

The ZIP Code maps and database are updated 4 times per year.
Database updated: February 1, 2018, Maps updated: February 1, 2018.

EXTREMELY LOCAL Demographic Data

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51301 ZIP Code Map

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Spencer, IA 51301 Data & Demographics (As of July 1, 2017)


Total Population 12,972
Daytime Population: Workers 8,995
Daytime Population: Residents 6,656
Total Daytime Population (TDP) 15,651
Ratio TDP/Total Population1 1.21
Population in Households 12,719
Population in Familes 9,770
Population in Group Qrtrs 253
Population Density2 87
Diversity Index3 18


Median Household Income $50,260
Average Household Income $63,241
Per Capita Income $28,012


Total Housing Units 6,203 (100%)
Owner Occupied HU 3,780 (60.9%)
Renter Occupied HU 1,910 (30.8%)
Vacant Housing Units 513 ( 8.3%)
Median Home Value $121,033
Average Home Value $147,374


Total Households 5,690
Average Household Size 2.24
Family Households 3,437
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.62% 0.47%
Households 0.51% 0.41%
Families 0.35% 0.31%
Median Household Income   1.13%
Per Capita Income   1.85%

Spencer, IA 51301 - Peer Comparisons by Rank and Percentile

The table below compares 51301 to the other 963 ZIP Codes in Iowa by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 68 93rd
Population Density # 209 78th
Diversity Index # 205 79th
Median Household Income # 676 30th
Per Capita Income # 483 50th

Additional comparisons and rankings can be made with a VERY EASY TO USE Iowa Census Data Comparison Tool.

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