In 1789, electors were popularly elected in DE, MD, MA*, NH*, PA, and VA; and chosen by the legislature in CT, GA, NJ, and SC.
So, only CT and NJ (well, and NH and MA really, since what you describe I would not call "chosen by popular vote") switched to popular vote from 1789 to 1824, while DE switched away from popular vote? Interesting.
No.
NH
1789 popular vote at large, majority needed, legislature chose all 6.
1792 popular vote at large, majority needed, popular runof.
1796 popular vote at large, majority needed, legislature chose 1 of 6.
1800 legislature.
1804-1832 at large popular.
MA (includes ME until 1820)
1789 popular vote by 8 district nominated 2, from which legislature picked + 2 chosen by legislature for state.
1792 popular vote from multi-member district (5,5,3, and 3). Majority required, otherwise legislature chose. A total of 5 were elected by voters, 11 by legislature.
1796 popular vote by 14 districts, with legislatute choosing in case no one had majority. 8 elected by voters, 6 by legislature. Legislature also chose 2 others.
1800 legislature
1804 popular vote at large.
1808 legislature.
1812 popular vote by multi-member district (5-6-4-3-3-1)
1816 legislature
1820-1832 at large.
ME
1820-1828 popular vote, 7 from district, 2 statewide.
1832 popular vote statewide.
RI
1792-1796 legislature
1800-1832 popular vote at large.
CT
1789-1816 legislature.
1820-1832 popular vote at large.
NY
1789 legislature, but could not agree on electors.
1792-1824 legioslature.
1828 popular vote. 34 chosen by congressional district (including 3 multi-member seats (3-2-2). These 34 chose the final 2 electors.
1832 popular vote at large.
NJ
1789-1800 legislature
1804-1808 popular vote at large.
1812 legislature
1816-1832 popular vote at large
DE
1789 popular vote by district/county
1792-1828 legislature
1832 popular vote at large
MD
1789-1792 popular vote at large
1796-1828 popular vote by electoral district. From 1804-1828, two districts elected two each.
1832 popular vote by multi-member district (4-3-2-1)
VA (included Kentucky in 1789)
1789-1796 popular vote by electoral district.
1800-1832 popular vote at large.
NC
1792 legislature
1796-1808 popular vote by electoral district.
1812 legislature
1816-1828 popular vote at large.
SC
1789-1832 (and continuing until 1860) legislature.
GA
1789-1792 legislature
1796 popular vote statewide
1800-1824 legislature
1828-1832 popular vote statewide
VT
1792-1824 legislature
1828-1832 popular vote statewide
KY
1792 popular vote, 2 each from 2 districts.
1796-1800 popular vote by electoral district.
1804-1824 popular vote by multi-member district (4-4), (4-4-4), (5-5-4)
1828-1832 popular vote statewide
TN
1796 legislature
1800 legislature appointed 3 persons in each county. These individuals chose 5 electors by district.
1804-1828 popular vote by electoral district
1832 popular vote statewide
OH
1804-1832 popular vote statewide
LA
1812-1824 legislature
1828-1832 popular vote statewide
IN
1816-1820 legislature
1824-1828 popular vote statewide
IL
1820-1824 popular vote by district
1828-1832 popular vote statewide.
AL
1820 legislature
1824-1832 popular vote at large
MS
1820-1832 popular vote at large
MO
1820 legislature (when Congress counted votes, tally with an without Missouri announced, leaving unresolved whether they were legal votes).
1824 popular vote by district
1828-1832 popular vote at large.
From 1836 forward, all electors have been chosen by statewide popular vote with the following exceptions:
SC 1836-1860 legislature
MA 1848 no candidate had majority, legislature chose electors (presumably was law in other elections, but did not come into effect),
FL 1868 legislature
CO 1876 legislature
MI 1892 popular vote by district.
ME 1972-present popular vote by district and 2 statewide
NE 19??-present popular vote by district and 2 statewide.
Ah, that explains that. When was that research effort?
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It began in 1962. I'm not sure when it finished, probably late 1860s.
ISPSR click on XIV.A.3.a US election returns The most likely had a date of 1984, but this might be when the results were converted to a machine readable form.
What about them? I think a majority of electors was popularly chosen at every election except one (1800 I think).