AdMob, a mobile advertising marketplace, announced today that it has hit a rate of 1 billion mobile ads served per month, according to information from the company.

Advertisers include Atlantic Records, Countrywide Home Loans, EA, JCPenney, MSN, Starbucks, and Windows Mobile, among others.

Data from the company reports that AdMob generates 520 million impressions per month in the US, compared to AOL's Third Screen Media, which triggers 225 million impressions.

Over 2000 mobile websites appear in the AdMob network, which launched a year in a half ago.