2022 NAICS national industry in sector 56 Administrative and Support and Waste Management and Remediation Services
561421 Telephone Answering Services
NAICS 561421 is the US industry code for telephone answering services. This U.S.
- Code
- 561421 (2022 NAICS)
- Title
- Telephone Answering Services
- Part of
- Telephone Call Centers
- SBA small business limit
- Average annual receipts up to $19 million
- Closest UK SIC
- 82200 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This U.S. industry comprises establishments primarily engaged in answering telephone calls and relaying messages on behalf of clients or for other establishments of the same enterprise.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Establishments primarily engaged in providing paging or beeper transmission services are classified in U.S. Industry 517112, Wireless Telecommunications Carriers (except Satellite).
Businesses that use this code
Activities listed under 561421
The Census index assigns these 8 activities to this code. If your business matches one, this is your code.
- Answering services, telephone
- Emergency telephone dispatch (i.e., contractor) services
- Local call centers (e.g., answering services, message services)
- Message services, telephone answering
- Telephone answering services
- Telephone call forwarding services
- Voice mailbox services
- Wakeup call services
SBA size standard for 561421
To count as a small business for SBA loans and federal contracts under NAICS 561421, your business (including affiliates) must not exceed $19 million in average annual receipts. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 8220), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.