SIC 4581 to NAICS Code Crosswalk
The legacy 1987 SIC code 4581 (Airports, Flying Fields, and Airport Terminal Services) maps transitively to modern U.S. Census 2022 NAICS code(s): 238990, 488111, 488119, 488190, 561720.
Concordance Concordance Mapping Asset
| Source Code | Source Industry | Target Code | Target Industry | Relation | Concordance Path |
|---|---|---|---|---|---|
| SIC 4581 | Airports, Flying Fields, and Airport Terminal Services | NAICS 238990 | All Other Specialty Trade Contractors | One-to-Many | SIC1987:4581 → NAICS1997:56172 → 2002:238990 → 2007:238990 → 2012:238990 → 2017:238990 → 2022:238990 |
| SIC 4581 | Airports, Flying Fields, and Airport Terminal Services | NAICS 488111 | Air Traffic Control | One-to-Many | SIC1987:4581 → NAICS1997:488111 → 2002:488111 → 2007:488111 → 2012:488111 → 2017:488111 → 2022:488111 |
| SIC 4581 | Airports, Flying Fields, and Airport Terminal Services | NAICS 488119 | Other Airport Operations | One-to-Many | SIC1987:4581 → NAICS1997:488119 → 2002:488119 → 2007:488119 → 2012:488119 → 2017:488119 → 2022:488119 |
| SIC 4581 | Airports, Flying Fields, and Airport Terminal Services | NAICS 488190 | Other Support Activities for Air Transportation | One-to-Many | SIC1987:4581 → NAICS1997:48819 → 2002:488190 → 2007:488190 → 2012:488190 → 2017:488190 → 2022:488190 |
| SIC 4581 | Airports, Flying Fields, and Airport Terminal Services | NAICS 561720 | Janitorial Services | One-to-Many | SIC1987:4581 → NAICS1997:56172 → 2002:561720 → 2007:561720 → 2012:561720 → 2017:561720 → 2022:561720 |
Why Concordances Don't Line Up 1:1
The Standard Industrial Classification (SIC) system was established in 1937 and last updated in 1987, organizing businesses by end products. The North American Industry Classification System (NAICS) replaced it in 1997, classifying establishments by production processes. Because of this structural shift, many-to-many relationships are common, requiring chained concordance steps to bridge the historical gap.
Reverse Crosswalk: Going the other way? See the mapping at NAICS 238990 to SIC, NAICS 488111 to SIC, NAICS 488119 to SIC, NAICS 488190 to SIC, NAICS 561720 to SIC.
Related Pages & Tools
- SIC Code 4581 Profile — Legacy OSHA definition and associated industrial metadata.
- SIC Major Group 45 Hub — Legacy category group directory.
- Interactive Crosswalk Engine — Convert any SIC or NAICS code dynamically.
Primary Ingestion Source
Data sourced from the U.S. Census Bureau Concordances (1997, 2002, 2007, 2012, 2017, and 2022 editions). Last verified on 2026-06-30.