Arnold is a city in northeastern Jefferson County, Missouri, situated near the confluence of the Meramec and Mississippi rivers.

In the area where 2 salt licks used to be, human bones have been found, along with pottery shards and many other artifacts.

The first European settler in Arnold, was John Hildebrand an immigrant from Germany, that lived in Monongahela County, Pennsylvania.

He was the first white settler in the area that is today Jefferson county, he established a settlement near saline creek, with a fort for protection.

In 1776 Jean Baptiste Gamache, who operated a ferry boat across the Meramec River was granted 1050 arpents of land by king Charles III of Spain.

One such hold out was Homer R. Tourkakis, the owner of a dental practice on the corner of the triangle formed by Route 141 and Interstate 55.

Tourkakis's property was declared blighted, and Arnold sought to seize it under eminent domain.

Arnold and THF argued that although incorporated cities are not explicitly granted the use of eminent domain does not imply they are denied it.

The judge ruled that because Arnold is a third-class city, under Missouri law, it cannot use eminent domain to seize properties.

[7] In appeal to the Missouri Supreme Court, the decision was reversed, ruling that through the TIF act and the City of Arnold being an incorporated municipality, had the right to use eminent domain.

[11] In 2013 the Missouri Court of Appeals Eastern District ruled the Arnold red-light camera ordinance to be unconstitutional.

[12] On October 24, 1988 Republican vice-presidential candidate Dan Quayle addressed the students at Fox High School, listening to questions and discussing the fight on drugs.

During the summit, Clinton promised the governors of flood-damaged states that his administration would not abandon them once the water recedes.

[13] On April 29, 2009, United States President Barack Obama held a town hall meeting commemorating his 100th day in office at Fox High School in Arnold.

[18] The city is located at the confluence of the Meramec and Mississippi rivers,[19] just south of St. Louis County.

Arnold is home to one of two offices of the National Geospatial Intelligence Agency in the St. Louis area[26] employing at least 900 workers.

Many private entities in Arnold also offer recreational facilities and services, such as the Davidson Family Life Center and various sports fields on church or school property.

[29] The 68-acre park features a large fishing lake and four pavilions, each with electrical service and a barbecue grill.

The park also offers a playground, a paved walking and hiking trail, two multipurpose dirt fields, and equipment for horseshoes, volleyball,[30] and disc golf.

Other amenities include a playground, walking and hiking trails, two multipurpose grass fields, five horseshoe pits, three sand volleyball courts, Arnold Jaycees Skate Park, basketball half-court, dog park, and restrooms.

The 40,000 square feet (3,700 m2) facility is located at 1687 Missouri State Road behind the Arnold Library and Recreation Center.