how many numbers in a federal prison id number

A federal prison ID number is typically 8 digits total in the format 5 digits, a dash, then 3 digits — for example, 12345-054.

Quick Scoop

The first 5 digits are the main inmate number, and the last 3 digits are a district suffix tied to the federal processing or conviction system.

Simple answer

• Total digits: 8.
• Format: XXXXX-XXX.
• Example: 12345-054.

Small caveat

Some older or informal sources describe the number differently, but the current federal inmate register number is generally shown in that 5-plus-3 format.

TL;DR: A federal prison ID number is usually 8 digits long with a dash in the middle.