SIC Code 1311 — Crude Petroleum and Natural Gas

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

Code	1311
Title	Crude Petroleum and Natural Gas
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The SIC was last revised in 1987 and officially superseded by NAICS in 1997, but it never fully disappeared: the SEC still tags EDGAR filings with SIC codes, and many banks, insurers and legacy databases keep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 1311

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
211111	Crude Petroleum and Natural Gas Extraction	superseded — closest: 2111 Oil and Gas Extraction

Other SIC codes in 13xx

• 1321 — Natural Gas Liquids
• 1381 — Drilling Oil and Gas Wells
• 1382 — Oil and Gas Field Exploration Services
• 1389 — Oil and Gas Field Services, Not Elsewhere Classified

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.