Libertarian Party of California Regions

The California Libertarian Party subdivides the state into regions, typically one county per region. Does anyone know the origin and history of these regions?

01	East Bay (Alameda and Contra Costa Counties)
02	Alpine (merged into 09 -- possibly after 1992)
03	Gold Country (Amador, Calaveras, and Tuolumne Counties)
04	Butte County
05	Calaveras (merged into 03)
06	Colusa County
07	Contra Costa (merged into 01)
08	Del Norte County
09	El Dorado / Alpine
10	Fresno County (formerly the Central Valley/Valley Libertarians)
11	Glenn County
12	Humboldt County
13	Imperial County
14	Inyo County
15	Kern County
16	Kings County (split off from 10 in the late 1990s)
17	Lake County (used to include Menocino)
18	Lassen County
19	Los Angeles County (split into 61 through 68)
20	Madera/Mariposa (split off from 10 in the late 1990s)
21	Marin County
22	Mariposa (merged into 20 sometime after 1995)
23	Mendocino County
24	Merced County
25	Modoc County
26	Mono County (used to include Inyo)
27	Monterey County
28	Napa County
29	Nevada County
30	Orange County
31	Placer County
32	Plumas County
33	Riverside County (split into 70 and 71 sometime after 1995)
34	Sacramento County
35	San Benito County
36	San Bernardino County
37	San Diego County
38	San Francisco
39	San Joaquin County
40	San Luis Obispo County
41	San Mateo County
42	Santa Barbara County
43	Santa Clara County
44	Santa Cruz County
45	Shasta County
46	Sierra County
47	Siskiyou County
48	Solano County
49	Sonoma County
50	Stanislaus County
51	Sutter/Yuba
52	Tehama County
53	Trinity County
54	Tulare County (split off from 10 in the late 1990s)
55	Tuolumne (merged into 03)
56	Ventura County
57	Yolo County
58	Yuba (merged into 51)
59	?
60	?
61	San Fernando Valley
62	West Los Angeles
63	Foothills/Pasadena
64	Central Los Angeles
65	Southeast Los Angeles
66	South Bay
67	East San Gabriel Valley
68	Antelope Valley
69	?
70	West Riverside County
71	East Riverside County