Arnold, MO Profile: Facts, Map & Data


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Arnold, Missouri - Basic Facts

The City of Arnold had a population of 21,340 as of July 1, 2017. Arnold ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Missouri. See peer rankings below.

The primary coordinate point for Arnold is located at latitude 38.4262 and longitude -90.3693 in Jefferson County. The formal boundaries for the City of Arnold (see map below) encompass a land area of 11.58 sq. miles and a water area of 0.36 sq. miles. Jefferson County is in the Central time zone (GMT -6). The elevation is 600 feet.

The City of Arnold (GNIS ID: 2393991) 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 Arnold is located within Township of Arnold, a minor civil division (MCD) of Jefferson County.

Beneath the boundary map are tables with Arnold population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Neighborhood Data

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City of Arnold, MO Boundary Map

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Boundary Maps: Township of Arnold | Jefferson County | Missouri Counties

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Arnold, MO Data & Demographics (As of July 1, 2017)


Total Population 21,340
Population in Households 21,187
Population in Familes 17,483
Population in Group Qrtrs 153
Population Density1 1,842
Diversity Index2 14


Total Households 8,308
Average Household Size 2.55
Family Households 5,780
Average Family Size 3


Total Housing Units 8,832 (100%)
Owner Occupied HU 6,305 (71.4%)
Renter Occupied HU 2,003 (22.7%)
Vacant Housing Units 524 ( 5.9%)
Median Home Value $164,317
Average Home Value $179,080


Median Household Income $59,408
Average Household Income $70,961
Per Capita Income $27,832
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.35% 0.46%
Households 0.37% 0.47%
Families 0.2% 0.37%
Median Household Income   2.77%
Per Capita Income   2.81%
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.

Arnold, MO - Peer Comparisons by Rank and Percentile

The table below compares Arnold to the other 1,032 incorporated cities, towns and CDPs in Missouri 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 # 33 97th
Population Density1 # 117 89th
Diversity Index2 # 467 55th
Median Household Income # 161 84th
Per Capita Income # 204 80th

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

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