ANSI codes are standardized numeric or alphabetic codes issued by the American National Standards Institute (ANSI) to ensure uniform identification.

The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments.

NAPCS is a comprehensive, market- or demand-based, hierarchical classification system for products (goods and services) that is not industry-of-origin based.

Transactions are classified under approximately 8,000 different products complied under the Standard International Trade Classification (SITC).

The functional status (FUNCSTAT) code defines the current functional status of a geographic entity.

The legal/statistical area description (LSAD) codes describe the particular typology for each geographic entity.

The MAF/TIGER Feature Class Code (MTFCC) is a 5-digit code assigned by the Census Bureau intended to classify and describe geographic objects or features.

The class (CLASSFP) code defines the current class of a geographic entity.

These codes are found in the TIGER/Line products and are used to describe the types of roads.