Interpreting Block Number Tables

Many editions include a listing of block numbers somewhere in the prefatory material. Block numbers are usually used in real estate descriptions, and although that was not a function that fire insurance maps were designed to support, the presence of these listings indicates their value to insurance agents also.

Example of a Block Number Table

Sometimes there is also a table showing changes in the numbering system used in a city.

Example of Block Numbers that are changed

How to interpret:

• Reports on Fire Protection
• Congested Districts
• Scales
• Dates of Maps and Publications
• Sheet Numbers
• Indexes (Graphic, Special, Street)
• Water Systems