SIC Code 1629 — Heavy Construction, Not Elsewhere Classified

4-digit industry in the 1987 Standard Industrial Classification — still requested by banks, insurers, SEC filings and legacy systems.

Code	1629
Title	Heavy Construction, Not Elsewhere Classified
System	SIC 1987 (final edition — replaced by NAICS in 1997)

The SIC was last revised in 1987 and officially superseded by NAICS in 1997, but it never fully disappeared: the SEC still tags EDGAR filings with SIC codes, and many banks, insurers and legacy databases keep requesting it. That is why converting between the two systems is still routine work.

NAICS equivalents of SIC 1629

From the official U.S. Census concordance (1987 SIC → 2002 NAICS). Where the 2002 code no longer exists in NAICS 2022, the closest current code is shown.

NAICS 2002	Title (2002)	Current 2022 code
236210	Industrial Building Construction	236210 (same code)
237110	Water and Sewer Line and Related Structures Construction	237110 (same code)
237120	Oil and Gas Pipeline and Related Structures Construction	237120 (same code)
237130	Power and Communication Line and Related Structures Construction	237130 (same code)
237990	Other Heavy and Civil Engineering Construction	237990 (same code)
238910	Site Preparation Contractors	238910 (same code)

Other SIC codes in 16xx

• 1611 — Highway and Street Construction, Except Elevated Highways
• 1622 — Bridge, Tunnel, and Elevated Highway Construction
• 1623 — Water, Sewer, Pipeline, and Communications and Power Line Construction

Data: 1987 SIC titles (OSHA/Census) and official Census concordance — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.