Arnold, MO Profile: Facts & Data


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Arnold, Missouri - Basic Facts

The City of Arnold had a population of 21,400 as of July 1, 2020. 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 38.4328 and longitude -90.3776 in Jefferson County. The formal boundaries for the City of Arnold 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.


Arnold, MO Data & Demographics (As of July 1, 2020)


Total Population 21,400 (100%)
Population in Households 21,247 (99.3%)
Population in Families 17,505 (81.8%)
Population in Group Quarters1 153 ( 0.7%)
Population Density 1,857
Diversity Index2 15


Median Household Income $61,911
Average Household Income $78,912
% of Income for Mortgage4 11%
Per Capita Income $31,162
Wealth Index5 81


Total HU (Housing Units) 8,984 (100%)
Owner Occupied HU 6,492 (72.3%)
Renter Occupied HU 1,927 (21.4%)
Vacant Housing Units 565 ( 6.3%)
Median Home Value $161,585
Average Home Value $176,529
Housing Affordability Index3 226


Total Households 8,419
Average Household Size 2.52
Family Households 5,840
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2020 2020-2025
Population 0.2% 0.35%
Households 0.31% 0.43%
Families 0.17% 0.34%
Median Household Income   0.55%
Per Capita Income   1.41%
Owner Occupied HU   0.41%


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, 2020 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 # 35 97th
Population Density # 117 89th
Median Household Income # 185 82nd
Housing Affordability Index # 601 58th
Per Capita Income # 200 81st
Diversity Index # 454 56th

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

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