NANPA NPA-NXX TELECOM REGISTRY // AREA CODE 303

Area Code 303 (Denver, CO) Carrier & TCPA Lookup.

Real-time NANPA NPA-NXX carrier line type, operating company number (OCN), wireless porting status, and TCPA DNC serial litigator verification for (303) phone numbers in Denver, CO.

Run in Live Workbench View Credit Tiers ($49/mo)

NANPA Area Code (303) Telemetry Profile

NPA CODE: +1 (303)
PRIMARY MARKET: Denver, CO
TIMEZONE: MST (UTC-7)
DOMINANT CARRIERS: Qwest/Lumen, Verizon Wireless, Comcast
TCPA DNC SHIELD: ACTIVE (1 CREDIT / LOOKUP)

Test Area Code 303 via cURL or MCP

curl -s "https://www.verifygrid.io/v1/verify/telecom?phone=%2B13035550199" \
  -H "Authorization: Bearer vg_test_sandbox"

# Returns E.164, line_type (mobile/voip/landline),
# carrier_name, OCN, tcpa_dnc_listed, and safe_to_autodial

// NANPA INDEXPROGRAMMATIC US AREA CODE VERIFICATION DIRECTORY