10 
BULLETIN 1279, U. S. DEPARTMENT OF AGRICULTURE 
Table 1. — Road mileage, road income, and other related data for the United States 
in 1921, 1914, 1909, and 1904 
1921 
1914 
1909 
1904 
Total road mileage 
Surfaced mileage 
Percentage surfaced 
Total income for all rural road purposes 
State and local road and bridge bonds outstand- 
ing at end of year.. 
Land area (square miles) 
Population, total for United States 
Rural population... 
Miles of road per square mile of ar ea 
Miles of road per 1,000 of rural population 
Surfaced mileage per square mile of area 
Surfaced mileage per 1,000 of rural population.. 
Road and bridge income per mile of road 
Road and bridge income per square mile of area. 
Road and bridge income per capita 
2, 941, 294 
387. 760 
13.2 
$1,149,437,896 
2, 445, 761 
257, 291 
0.5 
i $240, 263. 784 
$1,222,312,300 $344, 763, 082 
2,973,714 
3 105, 273, 049 
3 51, 406. 017 
0.99 
57.2 
0.130 
7.54 
$390. 79 
$386. 52 
$10. 92 
2, 973. 830 
4 91, 641, 197 
4 49, 348, 883 
0.82 
49.5 
0.086 
5.21 
$98. 22 
$80. 79 
$2.62 
2, 
4 91. 
<49, 
, 199, 645 
190, 476 
8.7 
( 2 ) 
( 2 ) 
973, 830 
641, 197 
348, 883 
0.74 
44.6 
0.064 
3.86 
( 2 ) 
( 2 ) 
( 2 ) 
2, 151, 379 
153. 530 
7.1 
$79, 623, 617 
( 2 ) 
2, 974, 099 
5 75, 715, 857 
5 45, 197, 390 
0.72 
47.6 
0.052 
3.39 
$37.01 
$26. 77 
$1.05 
1 Income considered as equal to expenditure. 
2 No data available. 
3 1920 census. 
4 1910 census. 
1900 census. 
