Arnold, MO Profile: Facts, Map & Data


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Arnold, Missouri - Basic Facts

The City of Arnold had a population of 21,306 as of July 1, 2018. 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, 2018.

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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, 2018)


Total Population 21,306
Population in Households 21,153
Population in Familes 17,414
Population in Group Qrtrs 153
Population Density2 1,840
Diversity Index3 14


Median Household Income $61,861
Average Household Income $73,785
Per Capita Income $28,941


Total Housing Units 8,873 (100%)
Owner Occupied HU 6,072 (68.4%)
Renter Occupied HU 2,221 (25.0%)
Vacant Housing Units 580 ( 6.5%)
Median Home Value $166,983
Average Home Value $186,098


Total Households 8,293
Average Household Size 2.55
Family Households 5,776
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 0.29% 0.46%
Households 0.3% 0.46%
Families 0.17% 0.39%
Median Household Income   2.93%
Per Capita Income   3.0%

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, 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 # 36 97th
Population Density # 117 89th
Diversity Index # 481 54th
Median Household Income # 159 85th
Per Capita Income # 200 81st

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

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