The following are known Action Replay Codes for The Urbz: Sims in the City on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
67d854cd
02703eda
9d5c30c5
43bf932c

Infinite Simolians
acc8c0b8
28de7157

Always Max Motives
ee8272ed
ce7419ed
35b904dd
68ec0940

Max Skills
a16e8919
c144d259
ce76f139
072a5c57

Max Relationships
f09f3791
cd9b7591
d92c8521
1dd4065c

Max Gang Stats
0a045aaf
c2aba50e