According to Census 2000: Actual Population Statistics
Phoenix (1,321,045) is bigger than:
Baltimore (651,154), Boston (589,141), and Washington D.C. (572,059).
Mesa (396,375) is bigger than:
Pittsburgh (334,563), Cincinnati (331,285), Buffalo (292,648), and Newark (273,546).
Glendale (218,812) is bigger than:
Akron (217,074), Madison (208,854), and Ft. Wayne (205,727).
Scottsdale (202,705) is bigger than:
Grand Rapids (197,800), Richmond (197,790), Yonkers (196,086), and Durham (187,035).
Chandler (176,581) is bigger than:
Providence (173,618) and Worcester (172,648).
Tempe (158,625) is bigger than:
Paterson (149,222), Syracuse (147,306), Bridgeport (139,529), and Alexandria (128,283).
Gilbert (109,697) and Peoria (108,364) are both bigger than:
Waterbury (107,271), Manchester (107,006), Allentown (106,632), and Lowell (105,167).
All of these cities are bigger than Erie (103,717), Gary (102,746), and Cambridge (101,355).
Source: U.S. Census Bureau