AdWords account limits
These are the limits for an AdWords account:
- 500 campaigns (includes active and paused campaigns)
- 20,000 ad groups per campaign
- 5,000 keywords per ad group
- 300 display ads per ad group (includes image ads)
- 50 text ads per ad group
- 3 million keywords per account
- 10,000 location targets (targeted and excluded) per campaign, including up to 500 proximity targets per campaign*
https://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=40907