Union, Missouri
Central Time Zone (UTC-6) · MO · —
About Area Codes in Union, Missouri
Union, Missouri is served by area code 636, which was established in 1999 as a geographic split from a larger area code region. The city falls within the Central time zone (UTC-6). All calls to and from Union use the 636 area code prefix for local and long-distance dialing.
Other cities in area code 636
Frequently Asked Questions
What area code is Union, Missouri?
Union, Missouri uses area code 636.
What time zone is Union in?
Union is in the Central time zone (UTC-6).
Do I need to dial 10 digits when calling Union?
Standard 7-digit dialing is used for local calls within Union. However, 10-digit dialing is always accepted and required for long-distance calls.
When was area code 636 created?
Area code 636 was established in 1999 as a geographic split from a larger area code region to serve the growing population.
What cities share area code 636 with Union?
Other cities sharing area code 636 with Union include Arnold, Ballwin, Chesterfield, Crystal City, Eureka, among others.
Also called Union:
Union, MO · Central Time Zone