“The following table provides a timeline of what states had joined the NPVIC, what political parties controlled government at the time, and the state’s electoral votes in 2020.”
https://ballotpedia.org/National_Popular_Vote_Interstate_Compact
| State/District | Year | Government | Enactment | EVs (2020) |
|---|---|---|---|---|
| Maryland | 2007 | Democratic trifecta | Gov. Martin O’Malley signed legislation | 10 |
| New Jersey | 2008 | Democratic trifecta | Gov. Jon Corzine signed legislation | 14 |
| Illinois | 2008 | Democratic trifecta | Gov. Rod Blagojevich signed legislation | 20 |
| Hawaii | 2008 | Divided government | Democratic-controlled legislature overrode Gov. Linda Lingle’s (R) veto of legislation | 4 |
| Washington | 2009 | Democratic trifecta | Gov. Christine Gregoire signed legislation | 12 |
| Massachusetts | 2010 | Democratic trifecta | Gov. Deval Patrick signed legislation | 11 |
| Washington, D.C. | 2010 | Democratic trifecta | Mayor Adrian Fenty signed legislation | 3 |
| Vermont | 2011 | Democratic trifecta | Gov. Peter Shumlin signed legislation | 3 |
| California | 2011 | Democratic trifecta | Gov. Jerry Brown signed legislation | 55 |
| Rhode Island | 2013 | Democratic trifecta | Gov. Lincoln Chafee signed legislation | 4 |
| New York | 2014 | Divided government | Gov. Andrew Cuomo signed legislation | 29 |
| Connecticut | 2018 | Democratic trifecta | Gov. Dannel Malloy signed legislation | 7 |
| Delaware | 2019 | Democratic trifecta | Gov. John Carney signed legislation | 3 |
| New Mexico | 2019 | Democratic trifecta | Gov. Michelle Lujan Grisham signed legislation | 5 |
| Oregon | 2019 | Democratic trifecta | Gov. Kate Brown signed legislation | 7 |
| Total: | 187 |
Suspended
In Colorado, the state legislature passed NPVIC legislation in 2019, which Gov. Jared Polis (D) signed on March 15, 2019. Rose Pugliese and Don Wilson filed a veto referendum against the legislation, and collected signatures for the law to appear on the ballot. The veto referendum was certified for the ballot on August 29, 2019, which had the effect of suspending the law until voters decide the law’s fate at the election on November 3, 2020.
| State/District | Year | Government | Election | EVs (2020) |
|---|---|---|---|---|
| Colorado | 2019 | Democratic trifecta | On the ballot for November 3, 2020 | 9 |