In a second round of awards, Mayor Michael R. Bloomberg and Nashville Mayor Karl Dean’s bipartisan coalition of mayors -- Cities of Service -- will award grants of $200,000 to 10 new cities. The money, paid over two years, will enable the cities to hire chief service officers, whose jobs will be to help increase volunteerism and help the cities respond to critical local problems.

The coalition project is financed jointly by the Rockefeller Foundation and Bloomberg Philanthropies.

“In each of the now 20 unique and diverse cities receiving this grant, there will now be sustained opportunities to bring systematic change and greater impact to the way communities support each other," Rockefeller's president, Judith Rodin, said in a statement.

The cities chosen to receive the grants are Atlanta; Austin, Tex.; Baltimore; Baton Rouge, La.; Chula Vista, Calif.; Houston; Little Rock, Ark.;...