Louisiana 2012
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Election results from LA Secretary of State (https://voterportal.sos.la.gov/static/)
Precinct shapefile from LA House of Representatives (http://house.louisiana.gov/H_Redistricting2011/default_LouisianaPrecinctShapefiles)

Early votes and provisional ballots were reported at the parish level. These were distributed by candidate to precincts based on their share of the precinct-level reported vote.

Election results from the following parishes include "alpha" precincts in which voters within the same geographic boundaries are assigned to separate precincts by the first letter of their surname: Ascension, Assumption, Bossier, Caddo, East Baton Rouge, Lafayette, Lafourche, Rapides, St. Bernard, St. Charles, St. Landry, Terrebonne

The following precincts were modified to reflect alterations enacted prior to the 2012 election:

Avoyelles: Merge 2-5B/6-1A
Cameron: Merge 4E/4W, 12N/12S, 17E/17W
Concordia: Split 4-4/4-4A/4-4B, 5-2/5-2A/5-2B
Vermilion: Split 49B-1/49B-2
West Baton Rouge: Split 2-A/2-B; 11-A/11-B

Louisiana 2014
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Election results from LA Secretary of State (https://voterportal.sos.la.gov/static/)
Precinct shapefile from LA House of Representatives (http://house.louisiana.gov/H_Redistricting2011/default_LouisianaPrecinctShapefiles)

Early votes and provisional ballots were reported at the parish level. These were distributed by candidate to precincts based on their share of the precinct-level reported vote.

Election results from the following parishes include "alpha" precincts in which voters within the same geographic boundaries are assigned to separate precincts by the first letter of their surname: Ascension, Assumption, Bossier, Caddo, East Baton Rouge, Lafayette, Lafourche, Rapides, St. Charles, St. Landry, Terrebonne

The following precincts were modified to reflect alterations enacted prior to the 2014 election:

Avoyelles: Merge 2-5B/6-1A
Plaquemines: Merge 2-1/2-2, 4-1/4-2, 5-1/5-2
St. Charles: Merge 2-6/2-7, 3-1/3-6, 3-3/3-4, 6-2/6-3, 6-4/6-5
Vermilion: Split 49B-1/49B-2
West Baton Rouge: Split 2-A/2-B; 11-A/11-B

Louisiana 2015
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Election results from LA Secretary of State (https://voterportal.sos.la.gov/static/)
Precinct shapefile from LA House of Representatives (http://house.louisiana.gov/H_Redistricting2011/default_LouisianaPrecinctShapefiles)

Early votes were reported at the parish level. These were distributed by candidate to precincts based on their share of the precinct-level reported vote.

Election results from the following parishes include "alpha" precincts in which voters within the same geographic boundaries are assigned to separate precincts by the first letter of their surname: Ascension, Assumption, Bossier, Caddo, East Baton Rouge, Lafayette, Lafourche, Rapides, St. Charles, St. Landry, Terrebonne

The following precincts were modified to reflect alterations enacted prior to the 2015 election:

Avoyelles: Merge 2-5B/6-1A
Plaquemines: Merge 2-1/2-2, 4-1/4-2, 5-1/5-2
St. Charles: Merge 2-6/2-7, 3-1/3-6, 3-3/3-4, 6-2/6-3, 6-4/6-5
Vermilion: Split 49B-1/49B-2
West Baton Rouge: Split 2-A/2-B; 11-A/11-B

Louisiana 2016 primary
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Election results from LA Secretary of State (https://voterportal.sos.la.gov/static/)
Precinct shapefile from LA House of Representatives (http://house.louisiana.gov/H_Redistricting2011/default_LouisianaPrecinctShapefiles)

In the following parishes the precinct boundaries that were used for the 2015 general election were still in effect for the 2016 presidential primary, rather than the boundaries that were in effect for the 2016 general election: Catahoula, Claiborne, East Baton Rouge, Franklin, Iberville, Lincoln, Madison, Ouachita, Richland, St. James, St. Martin, Terrebonne, Union, Vermilion, West Feliciana, Winn

Early votes and provisional ballots were reported at the parish level. These were distributed by candidate to precincts based on their share of the precinct-level reported vote.

Election results from the following parishes include "alpha" precincts in which voters within the same geographic boundaries are assigned to separate precincts by the first letter of their surname: Ascension, Assumption, Bossier, Caddo, East Baton Rouge, Lafayette, Lafourche, Rapides, St. Charles, St. Landry, Terrebonne

The following precincts were modified to reflect alterations enacted prior to the 2016 primary:

Avoyelles: Merge 2-5B/6-1A
Plaquemines: Merge 2-1/2-2, 4-1/4-2, 5-1/5-2
St. Charles: Merge 2-6/2-7, 3-1/3-6, 3-3/3-4, 6-2/6-3, 6-4/6-5
Terrebonne: Merge 62/63
Vermilion: Split 49B-1/49B-2
West Baton Rouge: Split 2-A/2-B; 11-A/11-B

Louisiana 2017
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Election results from LA Secretary of State (https://voterportal.sos.la.gov/static/)
Precinct shapefile from LA House of Representatives (http://house.louisiana.gov/H_Redistricting2011/default_LouisianaPrecinctShapefiles)

Early votes were reported at the parish level. These were distributed by candidate to precincts based on their share of the precinct-level reported vote.

Election results from the following parishes include "alpha" precincts in which voters within the same geographic boundaries are assigned to separate precincts by the first letter of their surname: Ascension, Assumption, Bossier, Caddo, East Baton Rouge, Lafayette, Lafourche, Rapides, St. Charles, St. Landry, Terrebonne

The following precincts were modified to reflect alterations enacted prior to the 2017 election:

Avoyelles: Merge 2-5B/6-1A
Plaquemines: Merge 2-1/2-2, 4-1/4-2, 5-1/5-2
St. Charles: Merge 2-6/2-7, 3-1/3-6, 3-3/3-4, 6-2/6-3, 6-4/6-5
Vermilion: Split 49B-1/49B-2
West Baton Rouge: Split 2-A/2-B; 11-A/11-B

Louisiana 2020 primary
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Election results from LA Secretary of State (https://voterportal.sos.la.gov/static/)
Precinct shapefiles from the U.S. Census Bureau's 2020 Redistricting Data Program Phase 2 release.

Early votes and provisional ballots were reported at the parish level. These were distributed by candidate to precincts based on their share of the precinct-level reported vote.

Election results from the following parishes include "alpha" precincts in which voters within the same geographic boundaries are assigned to separate precincts by the first letter of their surname: Ascension, Assumption, Bossier, Caddo, East Baton Rouge, Lafourche, Rapides, St. Charles, St. Landry, Terrebonne

The following precincts were modified to reflect alterations enacted prior to the 2020 primary:

Avoyelles: Merge 2-5B/6-1A
East Baton Rouge: Split 3-16/3-71, 3-32/3-72
Plaquemines: Merge 2-1/2-2, 4-1/4-2, 5-1/5-2
St. Charles: Merge 2-6/2-7, 3-1/3-6, 3-3/3-4, 6-2/6-3, 6-4/6-5
Vermilion: Split 49B-1/49B-2
Webster: Merge 7/11
West Baton Rouge: Split 2-A/2-B; 11-A/11-B