E911 Addressing

Amending Street Names & Numbers
E911 Addressing is a part of the St. Charles County Department of Emergency Communications. Per County Ordinance 08-100, the Department of Emergency Communications is authorized to establish and amend street names and numbers within unincorporated St. Charles County. The department is also authorized to work with municipalities within St. Charles County to establish and amend street names and numbers within a specific municipality. Address amendments may be performed on occasion if the address has been duplicated, or is of such a nature as to potentially impact the effectiveness of emergency response.

Building in Unincorporated St. Charles County
If you are constructing a building within unincorporated St. Charles County, please consult the Department of Emergency Communications to ensure a proper address has been assigned. If an address has not been assigned, you will be directed to complete the address request form from either the Community Development Department or the Department of Emergency Communications. For assistance in completing the form, or for general questions concerning addressing issues, please feel free to contact us by phone at 636-949-7481.