Alton, IL Profile: Facts & Data


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Alton, Illinois - Basic Facts

The City of Alton had a population of 26,730 as of July 1, 2018. Alton ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Alton is located at latitude 38.9021 and longitude -90.1541 in Madison County. The formal boundaries for the City of Alton (see map below) encompass a land area of 15.47 sq. miles and a water area of 1.27 sq. miles. Madison County is in the Central time zone (GMT -6). The elevation is 495 feet.

The City of Alton (GNIS ID: 2393935) 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 Alton, a minor civil division (MCD) of Madison 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, 2018.

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Alton, IL Data & Demographics (As of July 1, 2018)


Total Population 26,730
Population in Households 26,220
Population in Familes 19,609
Population in Group Qrtrs 510
Population Density1 1,728
Diversity Index2 51


Median Household Income $37,208
Average Household Income $50,246
Per Capita Income $21,808


Total Housing Units 13,266 (100%)
Owner Occupied HU 6,530 (49.2%)
Renter Occupied HU 4,762 (35.9%)
Vacant Housing Units 1,975 (14.9%)
Median Home Value $83,279
Average Home Value $98,530


Total Households 11,291
Average Household Size 2.32
Family Households 6,497
Average Family Size 3
  1. Population Density = Total Population per square mile.
  2. 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 -0.5% -0.34%
Households -0.47% -0.31%
Families -0.65% -0.46%
Median Household Income   1.14%
Per Capita Income   2.4%

Alton, IL - Peer Comparisons by Rank and Percentile

The table below compares Alton to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2018 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 # 81 94th
Population Density # 368 73rd
Diversity Index # 179 87th
Median Household Income # 1282 6th
Per Capita Income # 1190 13th

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

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Compare Illinois July 1, 2018 Data
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