Rank of each County within USA by Total population in 2000
1 Los Angeles County, CA 9,519,338
2 Cook County, IL 5,376,741
3 Harris County, TX 3,400,578
4 Maricopa County, AZ 3,072,149
5 Orange County, CA 2,846,289
6 San Diego County, CA 2,813,833
7 Kings County, NY 2,465,326
8 Miami-Dade County, FL 2,253,362
9 Queens County, NY 2,229,379
10 Dallas County, TX 2,218,899
11 Wayne County, MI 2,061,162
12 King County, WA 1,737,034
13 San Bernardino County,Ca 1,709,434
14 Santa Clara County, CA 1,682,585
15 Broward County, FL 1,623,018
16 Riverside County, CA 1,545,387
17 New York County, NY 1,537,195
18 Philadelphia County, PA 1,517,550
19 Middlesex County, MA 1,465,396
20 Tarrant County, TX 1,446,219
21 Alameda County, CA 1,443,741
22 Suffolk County, NY 1,419,369
23 Cuyahoga County, OH 1,393,978
24 Bexar County, TX 1,392,931
25 Clark County, NV 1,375,765
26 Nassau County, NY 1,334,544
27 Bronx County, NY 1,332,650
28 Allegheny County, PA 1,281,666
29 Sacramento County, CA 1,223,499
30 Oakland County, MI 1,194,156
31 Palm Beach County, FL 1,131,184
32 Hennepin County, MN 1,116,200
33 Franklin County, OH 1,068,978
34 St. Louis County, MO 1,016,315
35 Hillsborough County, FL 998,948
36 Fairfax County, VA 969,749
37 Erie County, NY 950,265
38 Contra Costa County, CA 948,816
39 Milwaukee County, WI 940,164
40 Westchester County, NY 923,459
41 Pinellas County, FL 921,482
42 DuPage County, IL 904,161
43 Salt Lake County, UT 898,387
44 Shelby County, TN 897,472
45 Orange County, FL 896,344
46 Bergen County, NJ 884,118
47 Fairfield County, CT 882,567
48 Honolulu County, HI 876,156
49 Montgomery County, MD 873,341
50 Marion County, IN 860,454
51 Hartford County, CT 857,183
52 Hamilton County, OH 845,303
53 Pima County, AZ 843,746
54 New Haven County, CT 824,008
55 Fulton County, GA 816,006
56 Travis County, TX 812,280
57 Prince Georges County, MD 801,515
58 Fresno County, CA 799,407
59 Essex County, NJ 793,633
60 Macomb County, MI 788,149
61 Duval County, FL 778,879
62 San Francisco County, CA 776,733
63 Baltimore County, MD 754,292
64 Ventura County, CA 753,197
65 Worcester County, MA 750,963
66 Middlesex County, NJ 750,162
67 Montgomery County, PA 750,097
68 Monroe County, NY 735,343
69 Essex County, MA 723,419
70 San Mateo County, CA 707,161
71 Pierce County, WA 700,820
72 Mecklenburg County, NC 695,454
73 Jefferson County, KY 693,604
74 Suffolk County, MA 689,807
75 El Paso County, TX 679,622
76 DeKalb County, GA 665,865
77 Jefferson County, AL 662,047
78 Kern County, CA 661,645
79 Multnomah County, OR 660,486
80 Oklahoma County, OK 660,448
81 Jackson County, MO 654,880
82 Baltimore, MD (city) 651,154
83 Norfolk County, MA 650,308
84 Lake County, IL 644,356
85 Wake County, NC 627,846
86 Providence County, RI 621,602
87 Monmouth County, NJ 615,301
88 Hudson County, NJ 608,975
89 Cobb County, GA 607,751
90 Snohomish County, WA 606,024
91 Bucks County, PA 597,635
92 Gwinnett County, GA 588,448
93 Kent County, MI 574,335
94 District of Columbia, DC 572,059
95 Davidson County, TN 569,891
96 Hidalgo County, TX 569,463
97 San Joaquin County, CA 563,598
98 Tulsa County, OK 563,299
99 Montgomery County, OH 559,062
100 Bernalillo County, NM 556,678
101 Denver County, CO 554,636
102 Delaware County, PA 550,864
103 Summit County, OH 542,899
104 Bristol County, MA 534,678
105 Jefferson County, CO 527,056
106 Union County, NJ 522,541
107 El Paso County, CO 516,929
108 Ramsey County, MN 511,035
109 Ocean County, NJ 510,916
110 Camden County, NJ 508,932
111 Will County, IL 502,266
112 New Castle County, DE 500,265
113 Collin County, TX 491,675
114 Anne Arundel County, MD 489,656
115 Passaic County, NJ 489,049
116 Arapahoe County, CO 487,967
117 Orleans Parish, LA 484,674
118 Lake County, IN 484,564
119 Polk County, FL 483,924
120 Brevard County, FL 476,230
121 Plymouth County, MA 472,822
122 Lancaster County, PA 470,658
123 Morris County, NJ 470,212
124 Douglas County, NE 463,585
125 Sonoma County, CA 458,614
126 Onondaga County, NY 458,336
127 Hampden County, MA 456,228
128 Jefferson Parish, LA 455,466
129 Lucas County, OH 455,054
130 Sedgwick County, KS 452,869
131 Johnson County, KS 451,086
132 Stanislaus County, CA 446,997
133 Washington County, OR 445,342
134 Richmond County, NY 443,728
135 Volusia County, FL 443,343
136 Lee County, FL 440,888
137 Genesee County, MI 436,141
138 Chester County, PA 433,501
139 Denton County, TX 432,976
140 Dane County, WI 426,526
141 Virginia Beach, VA (city) 425,257
142 Burlington County, NJ 423,394
143 Guilford County, NC 421,048
144 Spokane County, WA 417,939
145 East Baton Rouge Parish, LA 412,852
146 Kane County, IL 404,119
147 Monterey County, CA 401,762
148 Mobile County, AL 399,843
149 Santa Barbara County, CA 399,347
150 Solano County, CA 394,542
151 Knox County, TN 382,032
152 York County, PA 381,751
153 Hillsborough County, NH 380,841
154 Greenville County, SC 379,616
155 Stark County, OH 378,098
156 Polk County, IA 374,601
157 Berks County, PA 373,638
158 Westmoreland County, PA 369,993
159 Utah County, UT 368,536
160 Tulare County, CA 368,021
161 Seminole County, FL 365,196
162 Adams County, CO 363,857
163 Pulaski County, AR 361,474
164 Waukesha County, WI 360,767
165 Dakota County, MN 355,904
166 Fort Bend County, TX 354,452
167 Mercer County, NJ 350,761
168 St. Louis, MO (city) 348,189
169 Clark County, WA 345,238
170 Pasco County, FL 344,765
171 Orange County, NY 341,367
172 Washoe County, NV 339,486
173 Clackamas County, OR 338,391
174 Cameron County, TX 335,227
175 Butler County, OH 332,807
176 Allen County, IN 331,849
177 Sarasota County, FL 325,957
178 Lane County, OR 322,959
179 Washtenaw County, MI 322,895
180 Richland County, SC 320,677
181 Luzerne County, PA 319,250
182 Nueces County, TX 313,645
183 Lehigh County, PA 312,090
184 Charleston County, SC 309,969
185 Hamilton County, TN 307,896
186 Forsyth County, NC 306,067
187 Cumberland County, NC 302,963
188 Ada County, ID 300,904
189 Anoka County, MN 298,084
190 Somerset County, NJ 297,490
191 Albany County, NY 294,565
192 Escambia County, FL 294,410
193 Montgomery County, TX 293,768
194 Boulder County, CO 291,288
195 Rockland County, NY 286,753
196 Marion County, OR 284,834
197 Lorain County, OH 284,664
198 St. Charles County, MO 283,883
199 Erie County, PA 280,843
200 Prince William County, VA 280,813
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