How Do NFL Players Get Their Jersey Numbers?

All players must wear numerals on their jerseys in accordance with Rule 5, Section 3, Article 3c (see NOTE 1), and such numerals must be by playing position as follows: quarterbacks, punters, and placekickers, 1-19 (and 10-19 for wide receivers if 80-89 are all otherwise assigned); running backs and defensive backs, 20-49; centers, 50-59 (60-79 if 50-59 unavailable); offensive guards and tackles, 60-79; wide receivers and tight ends, 80-89; defensive lineman, 60-79 (90-99 if 60-79 unavailable); and linebackers 50-59 (90-99 if 50-59 unavailable).

If a player changes his position during his playing career in the NFL and such change moves him out of a category specified above, he must be issued an appropriate new jersey number.