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July 30, 1917 -
SONOMA exchanged with MENDOCINO
Calif. Stats. 1917, 42nd sess., ch. 725/p. 1396
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May 13, 1861 -
July 30, 1917
SONOMA gained from MARIN [repealed part of act of 25 April 1860]
Calif. Stats. 1861, 12th sess., ch. 346/p. 351
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April 25, 1860 -
May 13, 1861
SONOMA lost to MARIN when boundary was changed to run on road [see 13 May 1861]
Calif. Stats. 1860, 11th sess., ch. 288/p. 269
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March 11, 1859 -
April 25, 1860
SONOMA exchanged with MENDOCINO
Calif. Stats. 1859, 10th sess., ch. 108/pp. 98-99
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April 27, 1855 -
March 11, 1859
SONOMA gained from MARIN, exchanged with MENDOCINO, lost to SOLANO
Calif. Stats. 1855, 6th sess., ch. 125/p. 150
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April 04, 1855 -
April 27, 1855
SONOMA lost to NAPA
Calif. Stats. 1855, 6th sess., ch. 68/p. 77
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May 03, 1852 -
April 04, 1855
SONOMA lost Mare Island when SONOMA boundaries were redefined. Mare Island remained a non-county area until 27 January 1853 when it became part of SOLANO.
Calif. Stats. 1852, 3d sess., ch. 147/p. 236
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February 18, 1850 -
May 03, 1852
SONOMA created from non-county area. MARIN and MENDOCINO not fully organized, both attached to SONOMA "for judicial purposes".
Calif. Stats. 1849, 1st sess., ch. 15, sec. 12/p. 60
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