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Summary for Arnold

About Arnold (Click for our profile page)

Located in: Jefferson County (see below)

Time Zone: Arnold lies in the Central Time Zone (CST/CDT)

Telephone Area Code: 636

ZIP Code: 63010<1>

Elevation: 500 feet [152.4 m] above sea level<2>

From the 2010 US Census (For more detail, see our Census Page for Arnold)

Population

Year	Population
2019 Est:<3>	21,134 (1.57% increase since 2010)
2010:	20,808 (4.22% increase since 2000)
2000:	19,965

Total Area:<4> 11.94 sq. miles [30.9 km²] - of which 3.02% is water (0.36 sq. miles [0.9 km²])

Housing Units:<5> 8,547

Official Website: www.arnoldmo.org/

GPS Coordinates (Latitude/Longitude)<6>

For the purpose of mapping and calculating distances, we have chosen the following reference point for Arnold:

Lat: 38.429000° (or 38°25'44" N)

Lon: -90.371500° (or -90°22'17" W)

USGS Topo Map: Oakville<7>

Federal GNIS/FIPS Codes for Arnold

GNIS ID: 2393991

FIPS State / Place Code: 29 / 01972

(For more about Federal Codes, see our Misc Page for Arnold)

About Jefferson County

The city of Hillsboro is the County Seat for {Jefferson County}.

From the 2010 US Census (For more detail, see our Census Page for Jefferson)

Population

Year	Population
2019 Est:	225,081 (2.72% increase since 2010)
2010	219,128 (10.62% increase since 2000)
2000:	198,099

Total Area: 664 sq. miles [1,720.5 km²] - of which 1.15% is water (7.66 sq. miles [19.8 km²])

Housing Units: 87,626

Official Website: https://www.jeffcomo.org/

Federal GNIS/FIPS Codes for Jefferson

GNIS ID: 758504

FIPS State / County Code: 29 / 099

(For more about Federal Codes, see our Misc Page for Arnold)

About Missouri

From the US Census

Population

Year	Population
2019 Est:	6,140,475 (2.53% increase since 2010)
2010:	5,988,927 (7.04% increase since 2000)
2000:	5,595,211

Websites for State of Missouri

Official Website: https://www.mo.gov/

Tourism: https://www.visitmo.com/

Parks: https://mostateparks.com/

Fishing: https://mdc.mo.gov/fishing

Hunting: https://mdc.mo.gov/hunting-trapping

Federal GNIS/FIPS Codes for State of Missouri

GNIS ID: 1779791

FIPS State: 29

(For more about Federal Codes, see our Misc Page for Arnold)

Footnotes ...

<1>	ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a city (such as Arnold). When looking for a ZIP Code, whether Arnold or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<2>	The elevation is an estimate for the area around Arnold - it will be higher in some places and lower in others.
<3>	Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2019.
<4>	The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Arnold. The value given by the Census Bureau reflects their statistical (or sampling) requirements. For example, if there is a cluster of people living just outside of the community's official boundary, the Census-defined area might be expanded to include that group.
<5>	A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).
<6>	Longitude & latitude values may not be the geographic center of Arnold, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source.
<7>	Name of the USGS 7.5 Minute topographic map which includes Arnold.