City of Santa Cruz (1998-1999 growth rate: 2.6%)
| Year | Population | Source |
| 2020 | 64,386 | AMBAG (31.3% increase from 1990) |
| 2010 | 63,866 | AMBAG |
| 2000 | 55,013 | AMBAG |
| 1999 | 55,700 | CA Dept of Finance ests, Table E-1 |
| 1998 |
54,300
|
CA Dept of Finance ests, Table E-1 |
| 1990 |
49,040
|
AMBAG |
| 1980 |
41,483
|
CA Dept of Finance ests, Table E-4 |
| 1970 |
32,076
|
CA Dept of Finance ests, Table E-4 |
City of Capitola
| Year | Population | Source |
| 2020 |
11,750
|
AMBAG (15.5% increase from 1990) |
| 2010 |
11,500
|
AMBAG |
| 2000 |
11,172
|
AMBAG |
| 1990 |
10,171
|
AMBAG |
| 1980 |
9,095
|
CA Dept of Finance ests Table E-4 |
| 1970 |
5,080
|
CA Dept of Finance ests Table E-4 |
City of Scotts Valley
| Year | Population | Source |
| 2020 |
15,615
|
AMBAG (81.3% increase from 1990) |
| 2010 |
13,284
|
AMBAG |
| 2000 |
11,218
|
AMBAG |
| 1990 |
8,615
|
AMBAG |
| 1980 |
6,893
|
CA Dept of Finance ests Table E-4 |
| 1970 |
3,911
|
CA Dept of Finance ests Table E-4 |
City of Watsonville
| Year | Population | Source |
| 2020 |
55,875
|
AMBAG (79.7% increase from 1990) |
| 2010 |
51,881
|
AMBAG |
| 2000 |
43,620
|
AMBAG |
| 1990 |
31,099
|
AMBAG |
| 1980 |
23,663
|
CA Dept of Finance ests Table E-4 |
| 1970 |
14,719
|
CA Dept of Finance ests Table E-4 |
Unincorporated Areas
| Year | Population | Source |
| 2020 |
156,020
|
AMBAG (19.3% increase from 1990) |
| 2010 |
141,183
|
AMBAG |
| 2000 |
136,714
|
AMBAG |
| 1990 |
130,809
|
AMBAG |
| 1980 | ||
| 1970 |
County of Santa Cruz (1998-1999 growth rate: 1.5%)
| Year | Population | Source |
| 2040 | 497,319 | CA Dept of Finance projections (116.5% increase from 1990) |
| 2030 | 430,078 | CA Dept of Finance projections (87.2% increase from 1990) |
| 2020 | 367,196 | CA Dept of Finance projections (59.8% increase from 1990) |
| 303,646 | AMBAG (32.2% increase from 1990) | |
| 2010 | 309,206 | CA Dept of Finance projections |
| 281,714 | AMBAG | |
| 2000 | 260,248 | CA Dept of Finance projections |
| 257,737 | AMBAG | |
| 1999 | 255,825 | CA Dept of Finance projections |
| 252,800 | CA Dept of Finance ests, Table E-1 | |
| 1998 | 251,475 | CA Dept of Finance projections |
| 249,000 | CA Dept of Finance ests, Table E-1 | |
| 1992 | 230,992 | U.S. Census Bureau |
| 1990 | 229,734 | AMBAG |
| 1980 | 188,141 | U.S. Census Bureau |
| 1970 | 123,790 | CA Dept of Finance Intercensal ests, Table I 70-80 |
| 1960 | 85,100 | CA Dept of Finance Intercensal ests, Table I 47-69 |
| 1950 | 66,534 | CA Dept of Finance Intercensal ests, Table I 47-69 |
| 1940 | 45,057 | CA Dept of Finance Intercensal ests, Table I 47-69 |
State of California (1998-1999 growth rate: 1.6%)
| Year | Population | Source |
| 2040 | 58,731,006 | CA Dept of Finance projections (97.3% increase from 1990) |
| 2030 | 51,868,655 | CA Dept of Finance projections (74.3% increase from 1990) |
| 2020 | 45,448,627 | CA Dept of Finance projections (52.7% increase from 1990) |
| 2010 | 39,957,616 | CA Dept of Finance projections |
| 2000 | 34,653,395 | CA Dept of Finance projections |
| 1999 | 33,773,000 | CA Dept of Finance ests, Table E-1 |
| 1998 | 33,226,000 | CA Dept of Finance ests, Table E-1 |
| 1990 | 29,760,021 | CA Dept of Finance from Census |
| 1980 | 23,668,562 | CA Dept of Finance from Census |
| 1970 | 19,971,069 | CA Dept of Finance from Census |
| 1960 | 15,863,000 | CA Dept of Finance Intercensal ests, Table I 47-69 |
| 1950 | 10,586,223 | CA Dept of Finance Intercensal ests, Table I 47-69 |
| 1940 | 6,907,387 | CA Dept of Finance Intercensal ests, Table I 47-69 |