About Arnold, Maryland

Arnold is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 23,422 at the 2000 census. Neighborhoods straddle College Parkway and Ritchie Highway. Arnold is located on the scenic Broadneck peninsula. The ZIP code is 21012.

News from Arnold

Arnold Facts

  • Population Total: 23422
  • Square Miles: 10.8
  • Area Code: 410
  • Elevation: 128
  • Postal Codes: 21012
  • Timezone: North American Eastern