For more than 30 years, we’ve surveyed Washington-area law firms about their lawyer headcount. In the 2011 Legal Times 150, firms were asked to provide data for each office in the Washington metropolitan area — including the District of Columbia; Montgomery and Prince George’s counties in Maryland; and Arlington and Fairfax counties and the cities of Alexandria and Falls Church in Virginia.

The headcount numbers are as of April 1, 2011. The numbers do not include contract attorneys, patent agents or summer associates. And law firms were asked to tally full-time equivalents. Ties are ordered based on number of partners.