WT
William Thompson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Plaquemines-County, Louisiana
Our Model Tree links this William Thompson across the 1920, 1930 and 1940 US Censuses in Plaquemines-County, Louisiana (XGBoost, ~Confirmed), with identified parents Louis & William — first a son (b.~1915), then head of a 9-person household.
Age 25
b. ~1915
Male
Son
Born: Louisiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Plaquemines-County, Louisiana |
| Surname | Thompson |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Louisiana |
| 1935 Residence (City) | Police Jury Ward 9 |
| 1935 Residence (County) | Plaquemines |
| Additional Details | |
| Occupation | Laborer |
| Industry | Oil Field |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 360 |
| Highest Grade | 4 |
| 1935 Residence | Same House |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
| Occupation | Laborer |
| Township / Ward | Police Jury Ward 9 |
| Est. Birth Year | ~1915 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mary Philips | Daughter | — | 27 | ~1913 |
| Marjory Thompson | Daughter | — | 18 | ~1922 |
| Mina Thompson | Head | — | 54 | ~1886 |
| Oscar Philips | Other | — | 4 | ~1936 |
| Melvin Philips | Other | — | 11 | ~1929 |
| Mary Philips | Other | — | 8 | ~1932 |
| Russel Thompson | Son | — | 20 | ~1920 |
| Wilton Thompson | Son | — | 23 | ~1917 |
| William Thompson | Son | — | 25 | ~1915 |
Census Appearances
1920
Plaquemines, Louisiana
Son, age 5
Plaquemines, Louisiana · implied b. ~1915 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | William Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Mulatto |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Louisiana |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | Louisiana |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
1930
Plaquemines, Louisiana
Son, age 15
Plaquemines, Louisiana · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Louisiana |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | Louisiana |
| Can Read/Write | Yes |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
1940
Plaquemines-County, Louisiana
Son, age 25
Plaquemines-County, Louisiana · implied b. ~1915 — 9 household members
| Surname | Thompson |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Louisiana |
| 1935 Residence (City) | Police Jury Ward 9 |
| 1935 Residence (County) | Plaquemines |
| Occupation | Laborer |
| Industry | Oil Field |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 360 |
| Highest Grade | 4 |
| 1935 Residence | Same House |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links William Thompson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Louis Thompson (~0.92 confidence) and father William Thompson (~0.92 confidence) and mother Mena Thompson (~0.92 confidence) and mother Lena Thompson (~0.92 confidence) and mother Mina Thompson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Louis Thompson
b. ~1886
Source father
● Household
· direct · ~0.92
Father
William Thompson
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Mena Thompson
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Lena Thompson
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Mina Thompson
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Thompson
Son · 1940 · age 25 · b. ~1915 · Louisiana
★ You are viewing this record
Sibling
Wilton Thompson
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Russel Thompson
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Philips
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marjory Thompson
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Plaquemines-County, Louisiana
Open full size
1940 US Federal Census — Plaquemines-County, Louisiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01439-00215)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edna Sylve | 11 | Daughter | — | Louisiana |
| 2 | Anna Mae Sylve | 14 | Niece | — | Louisiana |
| 3 | Adrien Parker | 56 | Head | Farmer | Louisiana |
| 4 | Stella Parker | 55 | Wife | — | Louisiana |
| 5 | John M. Parker | 25 | Son | Farm Laborer | Louisiana |
| 6 | Beatrice Parker | 22 | Daughter | Packer | Louisiana |
| 7 | Bernard Parker | 19 | Son | Farm Helper | Louisiana |
| 8 | Bernice Jones | 26 | Daughter | — | Louisiana |
| 9 | Paul W. Jones | 5 | Grand-son | — | Louisiana |
| 10 | Rita Jones | 3 | Grand-daughter | — | Louisiana |
| 11 | Albert Gibson | 29 | Head | Laborer | Louisiana |
| 12 | Laura Gibson | 29 | Wife | — | Louisiana |
| 13 | Albertine Gibson | 4 | Daughter | — | Louisiana |
| 14 | Albert Jr. Gibson | 4 | Son | — | Louisiana |
| 15 | Ross Gibson | 2 | Son | — | Louisiana |
| 16 | Joseph Gibson | 0 | Son | — | Louisiana |
| 17 | Paul Gibson | 51 | Head | Farmer | Louisiana |
| 18 | Virginia Gibson | 61 | Wife | — | Louisiana |
| 19 | Julia Gibson | 30 | Daughter | — | Louisiana |
| 20 | Agnes Gibson | 25 | Daughter | House Work | Louisiana |
| 21 | Louis Gibson | 20 | Son | Farm Laborer | Louisiana |
| 22 | Paul L. Harvey | 11 | Grand-son | — | Louisiana |
| 23 | Mary L. Grant | 4 | Daughter | — | Louisiana |
| 24 | Edward Gibson | 35 | Head | Laborer | Louisiana |
| 25 | Viola Gibson | 20 | Wife | — | Louisiana |
| 26 | Mina Thompson | 54 | Head | — | Louisiana |
| 27 | William Thompson THIS PERSON | 25 | Son | Laborer | Louisiana |
| 28 | Wilton Thompson | 23 | Son | Fisherman | Louisiana |
| 29 | Russel Thompson | 20 | Son | Fisherman | Louisiana |
| 30 | Marjory Thompson | 18 | Daughter | — | Louisiana |
| 31 | Mary Philips | 27 | Daughter | — | Louisiana |
| 32 | Melvin Philips | 11 | Grand-son | — | Louisiana |
| 33 | Mary Philips | 8 | Grand-daughter | — | Louisiana |
| 34 | Oscar Philips | 4 | Grand-son | — | Louisiana |
| 35 | Adrien E. Jr. Parker | 29 | Head | Farmer | Louisiana |
| 36 | Florentine Parker | 23 | Wife | — | Louisiana |
| 37 | Bernard Parker | 20 | Brother | Laborer | Louisiana |
| 38 | Eugene Carson | 27 | Head | Laborer | Louisiana |
| 39 | Theresa Carson | 23 | Wife | — | Louisiana |
| 40 | Celestin La France | 46 | Head | Watchman | Louisiana |
Pedigree Summary
William + 4 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)