Spencer, IA Profile: Facts, Map & Data


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Spencer, Iowa - Basic Facts

The City of Spencer had a population of 11,401 as of July 1, 2015. Spencer ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Iowa. See peer rankings below.

The primary coordinate point for Spencer is located at latitude 43.147 and longitude -95.1527 in Clay County. The formal boundaries for the City of Spencer (see map below) encompass a land area of 10.83 sq. miles and a water area of 0.16 sq. miles. Clay County is in the Central time zone (GMT -6). The elevation is 1,319 feet.

The City of Spencer (GNIS ID: 468732) has a C2 Census Class Code which indicates an active incorporated place legally coextensive with a county subdivision but treated as independent of any county subdivision. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Spencer is located within , a minor civil division (MCD) of Clay County.

Beneath the boundary map are tables with Spencer population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2015.

Neighborhood Data

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City of Spencer, IA Boundary Map

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Spencer, IA Data & Demographics (As of July 1, 2015)


Total Population 11,401
Population in Households 11,163
Population in Familes 8,535
Population in Group Qrtrs 238
Population Density1 1,035
Diversity Index2 16


Total Households 5,150
Average Household Size 2.17
Family Households 3,073
Average Family Size 3


Total Housing Units 5,578 (100%)
Owner Occupied HU 3,356 (60.2%)
Renter Occupied HU 1,794 (32.2%)
Vacant Housing Units 428 ( 7.7%)
Median Home Value $135,142
Average Home Value $159,538


Median Household Income $46,909
Average Household Income $58,376
Per Capita Income $26,463
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.28% 0.25%
Households 0.5% 0.35%
Families 0.4% 0.24%
Median Household Income   2.67%
Per Capita Income   2.61%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.


Spencer, IA - Peer Comparisons by Rank and Percentile

The table below compares Spencer to the other 1,009 incorporated cities, towns and CDPs in Iowa by rank and percentile using July 1, 2015 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 # 32 97th
Population Density1 # 278 73rd
Diversity Index2 # 203 80th
Median Household Income # 711 30th
Per Capita Income # 469 54th

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