
The Regions

1. The Gulf Coast
Growth: 19.22%
Top Firm: Carr, Riggs & Ingram (Enterprise, Ala.; $100.31 in 2011 revenue)
Fastest-Growing Firm: Warren Averett (Birmingham, Ala.; grew 127.9%)
The Gulf Coast's double-digit growth is largely down to the three-way merger of midsized firms that created the new Warren Averett, as well as M&A at the region's leader, CRI, but all of our firms here grew their revenues.

2. The Southeast
Growth:18.37%
Top Firm: Dixon Hughes Goodman (Charlotte, N.C.; $295 million in 2011 revenue)
Fastest-Growing Firm: DHG (grew 52.85%)
The Southeast's high level of growth is also due, in part, to some major mergers, led by the creation of Dixon Hughes Goodman from Dixon Hughes and Goodman & Co.

3. The Mid-Atlantic Region
Growth: 6.55%
Top Firm: Marcum (New York City; $274.2 million in 2011 revenue)
Fastest-Growing Firm: Reinsel Kuntz Lesher (Lancaster, Pa., grew 34.86%)
Home to a significant portion of our Top 100 Firms, the Mid-Atlantic Region also claims a large share of accounting revenue -- and most of the firms here display strong, consistent growth.

4. The Great Lakes
Growth: 6.04%
Top Firm: Plante Moran (Southfield, Mich.; $304.35 million in 2011 revenue)
Fastest-Growing Firm: Wipfli (Milwaukee; grew 24.12%)
After 2010's contraction, firms in the Rust Belt managed healthy growth in 2011, helped no doubt by the resurgence in the car industry.

5. New England
Growth: 5.2%
Top Firm: Blum, Shapiro & Co. (West Hartford, Conn.; $47.27 million in 2011 revenue)
Fastest-Growing Firm: Abrams Little-Gill Loberfeld (Chestnut Hill, Mass.; grew 16.55%)
Two of New England's leading firms were acquired in 2011, but the region still managed to post much stronger growth than last year.

6. The Capital Region
Growth: 4.97%
Top Firm: Reznick Group (Bethesda, Md.; $202.5 million in 2011 revenue)
Fastest-Growing Firm: Aronson (Rockville, Md.; grew 10.14%)
Firms within reach of Washington, D.C., improved on their 2010 growth in 2011, buoyed by federal spending, and the beginnings of the economic recovery.

7. The West
Growth: 4.61%
Top Firm: Moss Adams (Seattle; $323 million in 2011 revenue)
Fastest-Growing Firm: Armanino McKenna (San Ramon, Calif.; grew 17.84%)
Mergers helped drive growth all up and down the West Coast, from LarsonAllen's many acquisitions in the Pacific Northwest (before its combination with Clifton Gunderson), to a host of inter-firm tie-ups in California.

8. The Mountain Region
Growth: 2.27% 2.27%
Top Firm: Ehhardt Keefe Steiner & Hottman (Denver; $58.47 million in 2011 revenue)
Fastest-Growing Firm: Squire & Co. (Orem, Utah; grew 11.93%)
Firms in the Mountain states bounced back from a disappointing performance in 2010 to show solid, if not spectacular, growth in 2011.

9. The Southwest
Growth: 1.96%
Top Firm: Weaver (Fort Worth, Texas; $66.4 million in 2011 revenue)
Fastest-Growing Firm: Whitley Penn (Fort Worth; grew 16.82%)
One of the weaker performers among the regions, the Southwest nonetheless improved on its performance from 2010, and looked forward to further growth boosted by the oil, gas and alternative energy sectors, among others.

10. The Midwest
Growth: 1.11%
Top Firm: BKD (Springfield, Mo.; $391.2 million in 2011 revenue)
Fastest-Growing Firm: RubinBrown (St. Louis; grew 13.73%)
The Midwest lagged the rest of the regions, and even managed to grow less in 2011 than it did in 2011. Growth rates at most firms were fairly meager -- St. Louis' RubinBrown broke the trend, but some of that is no doubt due to its aggressive expansion in Colorado.