Find any 983- phone number in Colorado
# Colorado Area Code 983
## Overview of Area Code 983
Area code 983 is a North American Numbering Plan (NANP) area code that serves portions of Colorado, primarily covering the Denver metropolitan area and surrounding regions. Established as an overlay area code, 983 was created to accommodate the growing demand for telephone numbers in a region experiencing significant population and economic expansion. Like other overlay area codes, 983 shares the same geographic territory as existing area codes, allowing multiple area codes to serve the same communities simultaneously. This means that residents and businesses in the affected regions may have phone numbers with either 983 or the original area code, depending on when their service was established.
## The North American Numbering Plan System
The North American Numbering Plan (NANP) is a standardized system that organizes telephone numbering across the United States, Canada, and several Caribbean nations. The system assigns three-digit area codes to geographic regions, followed by seven-digit local numbers. When population growth or increased telecommunications demand exhausts available numbers within an existing area code, regulatory bodies introduce overlay codes like 983 to expand capacity without requiring customers to change their existing numbers. This system ensures efficient allocation of telephone resources while maintaining the infrastructure necessary to support modern communication needs across North America's diverse and growing communities.