Ononydaga, a central county of New York, bounded N. E. by Oneida lake, and watered by the Oswego, Seneca, and Oneida rivers, and various creeks; area, 812 sq. m.; pop. in 1870, 104,183. Its surface is hilly but not broken in the south and level in the north, and the soil is remarkably fertile. It contains several lakes, of which the principal are Onondaga, Cross, Skaneateles, and Otisco. The Onondaga salt springs are in the valley of Onondaga lake, and yield large quantities of salt, the value in 1870 being $1,017,560. The Erie canal traverses the county, connecting at Syracuse with the Oswego canal, which extends to Lake Ontario. The New York Central railroad passes through Syracuse, from which various branches radiate. The chief productions in 1870 were 573,183 bushels of wheat, 566,558 of Indian corn, 1,119,263 of oats, 541,770 of barley, 51,249 of buckwheat, 589,816 of potatoes, 2,375,577 lbs. of butter, 821,562 of cheese, 339,740 of wool, 1,257,603 of tobacco, 233,399 of hop's, 56,505 of flax, and 118,629 tons of hay.

There were 15,162 horses, 29,394 milch cows, 17,835 other cattle, 63,265 sheep, and 16,826 swine; and numerous manufacturing establishments, of which the principal were 14 of agricultural implements, 17 of brick, 50 of carriages and wagons, 27 of cheese, 69 of cooperage, 2 of edge tools and axes, 7 of hardware, 18 of iron in various forms, 12 of machinery, 7 of musical instruments, 11 of paper, 20 of plaster work, 96 of salt, 31 of tobacco and cigars, 7 of woollen goods, 32 flour mills, and 34 saw mills. Capital, Syracuse.