Berry Appleman & Leiden, a new firm on the list this year, takes the top spot thanks to an attorney pool that is nearly half minority. That bumps last year's first-place finisher, Fragomen, down to second. In all, 71 firms had at least 20% minority attorneys, and seven had at least 20% minority partners.

The Diversity Scorecard records the average number of full-time-equivalent minority attorneys—Asian-American, African-American, Latino or Hispanic, Native American and self-described multiracial attorneys—at Am Law 200 and National Law Journal 250 law firms in the calendar year 2019.

Read More: The 2020 Diversity Scorecard Shows Progress, but It's More Precarious Than Ever

Partner statistics include both equity and nonequity partners. Nonpartner figures include associates as well as special counsel, of counsel and other staff attorneys. The survey does not include contract attorneys. Lawyers of Middle Eastern heritage are counted as nonminority attorneys for the purposes of this survey.

Each firm's diversity score is calculated by adding the minority percentage of all U.S. attorneys at the firms surveyed to the minority percentage of all U.S. partners at those firms.