Alton, IA Profile: Facts, Map & Data


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Alton, Iowa - Basic Facts

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The City of Alton had a population of 1,337 as of July 1, 2016. Alton 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 Alton is located at latitude 42.9875 and longitude -96.0091 in Sioux County. The formal boundaries for the City of Alton (see map below) encompass a land area of 1.85 sq. miles and a water area of 0 sq. miles. Sioux County is in the Central time zone (GMT -6). The elevation is 1,325 feet.

The City of Alton (GNIS ID: 2393936) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Alton is located within Township of Nassau, a minor civil division (MCD) of Sioux County.

Beneath the boundary map are tables with Alton population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Neighborhood Data

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City of Alton, IA Boundary Map

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Boundary Maps: Township of Nassau | Sioux County | Iowa Counties

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Alton, IA Data & Demographics (As of July 1, 2016)


Total Population 1,337
Population in Households 1,337
Population in Familes 1,136
Population in Group Qrtrs 0
Population Density1 724
Diversity Index2 19


Total Households 527
Average Household Size 2.54
Family Households 370
Average Family Size 3


Total Housing Units 544 (100%)
Owner Occupied HU 425 (78.1%)
Renter Occupied HU 103 (18.9%)
Vacant Housing Units 17 ( 3.1%)
Median Home Value $148,476
Average Home Value $179,765


Median Household Income $57,074
Average Household Income $68,531
Per Capita Income $26,966
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 1.53% 1.23%
Households 1.57% 1.29%
Families 1.46% 1.21%
Median Household Income   2.44%
Per Capita Income   2.05%
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.

Alton, IA - Peer Comparisons by Rank and Percentile

The table below compares Alton to the other 1,009 incorporated cities, towns and CDPs in Iowa by rank and percentile using July 1, 2016 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 # 234 77th
Population Density1 # 476 53rd
Diversity Index2 # 170 83rd
Median Household Income # 308 70th
Per Capita Income # 494 51st

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

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