Arnold, MO: Population, ZIP Codes & Nearby Cities

Arnold is a small incorporated city in Jefferson County, Missouri. In the dataset behind this page it has an estimated population of 21,091, sits at 38.430°N, 90.373°W, and observes Central time. Below you will find how it ranks inside Missouri, which ZIP codes it uses, the closest places around it, and how far it is from major US cities.

What are the key facts about Arnold, MO?

What is the population of Arnold, MO?

Arnold has an estimated population of 21,091. That makes it the 38th largest of the 1,020 places we list in Missouri, and the largest place in its county. The typical place in Missouri has about 482 residents, so Arnold is roughly 43.8 times the size of a typical neighbor in the state.

Estimates for places of this size carry wider margins of error than those for big cities, so treat the figure as a guide to scale. Our guide to understanding city population numbers explains why sources disagree.

Places in Missouri with a similar population include Rolla (21,059), Ferguson (20,525), Ozark (20,482), Poplar Bluff (20,359), Affton (20,148). Comparing these pages is a quick way to see how Arnold differs from communities of the same scale.

How dense is Arnold?

Arnold has about 1,829 people per square mile (706 per square kilometer), which we classify as suburban. Within Missouri, it is denser than about 89% of the listed places. Land at this level is usually a mix of single-family neighborhoods, shopping corridors and parks, where driving is common but destinations are close. Read how to interpret population density to see how we draw these lines.

What ZIP codes does Arnold use?

Arnold uses one ZIP code: 63010. A single code usually means a compact delivery area, but the same code may also serve addresses just outside the town line. Codes beginning with 6 are assigned to the central Midwest (Illinois, Kansas, Missouri and Nebraska). Learn more in our guide to how ZIP codes work or check any code with the ZIP code lookup.

What time zone is Arnold in?

Arnold is in the Central time zone, which is UTC−6 from Coordinated Universal Time in standard time (IANA zone America/Chicago). The area observes daylight saving time, so clocks move forward in March and back in November. The nearest listed place in a different time zone is Vincennes, IN, about 156 miles away, which gives a sense of how far the nearest zone boundary may be. Current local time: see the Central time hub. For the rules behind these zones, read US time zones explained.

Where is Arnold located in Missouri?

Arnold lies in the eastern part of Missouri, at 38.430° north latitude and 90.373° west longitude. The state capital, Jefferson City, is about 98 miles to the west. The closest listed place in another state is Columbia, IL, roughly 9 miles to the east, which shows how near Arnold is to a state line. For big-city services, the nearest place with more than 100,000 people is St. Louis, MO, 16 miles to the northeast.

Which cities are near Arnold, MO?

The closest listed place to Arnold is Oakville, MO, 3.1 miles to the northeast. Of the eight nearest places below, 2 are in the same county. Distances are straight-line (great-circle) miles measured between place centers; see how distance is calculated.

Which county is Arnold in?

Arnold is in Jefferson County, which has the Federal Information Processing Standards (FIPS) code 29099. The county contains 22 places in our data, 6 of which have their own page here and 16 smaller communities that appear only in county and state lists. Other places in the county include Festus (12,036), Murphy (7,961), De Soto (7,141), Pevely (5,978), Barnhart (5,948). Codes like this one help separate places that share a name; see the guide to counties and FIPS codes.

How far is Arnold from major US cities?

Among six major hubs, Arnold is closest to Chicago, IL at about 275 miles and farthest from Los Angeles, CA at about 1,583 miles in a straight line. Road distances are usually 10 to 30 percent longer. Try the distance calculator for any other pair.

Are there other places called Arnold?

Yes. Our data lists 4 other places named Arnold: Arnold, MD (23,406), Arnold, PA (4,831), Arnold, CA (2,291), Arnold, NE (568). When you search for Arnold, add the state or county so you land on the right one. This page covers the Arnold in Jefferson County, Missouri.

Planning a move to Arnold?

If you are weighing Arnold, start with the practical numbers: how far it is from where you live, whether it changes your time zone, and how its size and density compare with your current city. Use the distance calculator to measure the trip from where you live. The radius search tool lists every place within any distance of it. Our checklist for comparing cities explains what to check next.

Where to go next

Population and density come from a compiled dataset and are estimates. They may differ from official Census Bureau counts. Verify important figures at census.gov.