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March 12, 1870 -
YOLO lost small area to SACRAMENTO. See 1980_pt.shp and 1992_pt.shp for the location of small, non-mappable changes.
Calif. Stats. 1869, 18th sess., ch. 191/p. 294
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March 24, 1868 -
March 12, 1870
YOLO lost to LAKE
Calif. Stats. 1867, 17th sess., ch. 257/p. 269
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March 26, 1857 -
March 24, 1868
YOLO gained from SOLANO
Calif. Stats. 1857, 8th sess., ch. 104/p. 108
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April 19, 1856 -
March 26, 1857
YOLO lost to COLUSI (now COLUSA)
Calif. Stats. 1856, 7th sess., ch. 105/p. 124
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April 25, 1851 -
April 19, 1856
YOLO lost to COLUSI (now COLUSA)
Calif. Stats. 1851, 2d sess., ch. 14, sec. 28/p. 179
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February 18, 1850 -
April 25, 1851
YOLO created from non-county area; county was named "YOLA" in this act; by April 1850 the current spelling was in use
Calif. Stats. 1849, 1st sess., ch. 15, sec. 14/p. 61
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