State: Iowa
        
        Time zone: Eastern GMT -6:00. 
| Population: | 17,268 | 
| 2000 Population: | 16,710 | 
| White Population: | 16,490 | 
| Black Population: | 23 | 
| Hispanic Population: | 116 | 
| Asian Population: | 65 | 
| Hawaiian Population: | 12 | 
| Indian Population: | 1 | 
| Other Population: | 58 | 
| Male Population: | 8,062 | 
| Female Population: | 8,648 | 
| Median Age: | 73.9 | 
| Male Median Age: | 70.3 | 
| Female Median Age: | 77.8 | 
| Households: | 6,876 | 
| Average Household Size: | 5.13 | 
| Average House Value: | $167,600 | 
| Average Household Income: | $80,922 | 
| Land Area: | 276.666 sq mi | 
| Water Area: | 0.367 sq mi | 
Rock Valley Maple River , Mount Carmel , Roselle , Willey , Carroll
            Quimby, IA (       1.5 miles)
             Washta, IA (       6.5 miles)
             Cherokee, IA (       7.9 miles)
             Holstein, IA (       9.6 miles)
             Aurelia, IA (      11.1 miles)
             Cleghorn, IA (      12.4 miles)
             Cushing, IA (      12.7 miles)
             Meriden, IA (      13.2 miles)
             Marcus, IA (      13.4 miles)
             Galva, IA (      13.5 miles)
             
| 2000 Population: | 2,926,324 | 
| White Population: | 2,748,640 | 
| Black Population: | 61,853 | 
| Asian Population: | 36,635 | 
| Indian Population: | 8,989 | 
| Hawaiian Population: | 1,009 | 
| Other Population: | 37,420 | 
| Male Population: | 1,435,515 | 
| Female Population: | 1,490,809 | 
| Median Age: | 36.60 | 
| Male Median Age: | 35.20 | 
| Female Median Age: | 38.00 | 
| 2000 Households: | 1,149,276 | 
| White Households: | 1,098,906 | 
| Black Households: | 20,550 | 
| Asian Households: | 10,752 | 
| Indian Households: | 2,720 | 
| Hawaiian Households: | 284 | 
| Average Household Size: | 2.46 | 
| Average Family Size: | 3.00 |