MC
Mary Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Orleans-County, Louisiana
Our Model Tree links this Mary Cahill across the 1930 and 1940 US Censuses in Orleans-County, Louisiana (XGBoost, ~Confirmed) — first a daughter (b.~1903), then head of a 9-person household.
Age 37
b. ~1903
Female
Daughter
Born: Louisiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Orleans-County, Louisiana |
| Surname | Cahill |
| Given Name | Mary R |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Louisiana |
| 1935 Residence (City) | New Orleans City |
| 1935 Residence (County) | Orleans |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
| Township / Ward | New Orleans City |
| Est. Birth Year | ~1903 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| William Cahill | Son | — | 31 | ~1909 |
| Mary Conway | Other | — | 67 | ~1873 |
| Edward Cahill | Son | — | 42 | ~1898 |
| Loretta Cahill | Head | — | 65 | ~1875 |
| Helen Cahill | Daughter | — | 33 | ~1907 |
| Mary Cahill | Daughter | — | 37 | ~1903 |
| Lois Cahill | Daughter | — | 25 | ~1915 |
| Rose Cahill | Daughter | — | 29 | ~1911 |
| Elizabeth Cahill | Daughter | — | 35 | ~1905 |
Census Appearances
1930
Orleans, Louisiana
Daughter, age 27
Orleans, Louisiana · implied b. ~1903 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Marguerite |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Louisiana |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | Louisiana |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
1940
Orleans-County, Louisiana
Daughter, age 37
Orleans-County, Louisiana · implied b. ~1903 — 9 household members
| Surname | Cahill |
| Given Name | Mary R |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Louisiana |
| 1935 Residence (City) | New Orleans City |
| 1935 Residence (County) | Orleans |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| 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 Mary Cahill across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cahill
Daughter · 1940 · age 37 · b. ~1903 · Louisiana
★ You are viewing this record
Sibling
Elizabeth Cahill
Sibling · 1940 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lois Cahill
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Cahill
Sibling · 1940 · age 33
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Cahill
Sibling · 1940 · age 42
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Cahill
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Cahill
Sibling · 1940 · age 31
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 — Orleans-County, Louisiana
Open full size
1940 US Federal Census — Orleans-County, Louisiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01431-00548)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Paul A Cimino | 12 | Board son | — | Louisiana |
| 2 | Joseph Zink | 65 | Lodger | — | Louisiana |
| 3 | Anna Taupe | 35 | Head | Graduate Nurse | Louisiana |
| 4 | Louise Taupe | 26 | Lodger | Graduate Nurse | Louisiana |
| 5 | Loretta C Cahill | 65 | Head | — | Louisiana |
| 6 | Edward C Cahill | 42 | Son | Clerk | Louisiana |
| 7 | Mary R Cahill THIS PERSON | 37 | Daughter | — | Louisiana |
| 8 | Elizabeth F Cahill | 35 | Daughter | Teacher | Louisiana |
| 9 | Helen C Cahill | 33 | Daughter | Teacher | Louisiana |
| 10 | William A Cahill | 31 | Son | Engineering Aide | Louisiana |
| 11 | Rose Mary Cahill | 29 | Daughter | Clerical Worker | Louisiana |
| 12 | Lois J Cahill | 25 | Daughter | — | Louisiana |
| 13 | Mary Conway | 67 | Sister | Director Of Music | Louisiana |
| 14 | William O Hudson | 78 | Head | President | Georgia |
| 15 | Ellen B Hudson | 70 | Wife | — | Georgia |
| 16 | Robert W Jr Canase | 25 | Grand son | Office Machine Operator | Louisiana |
| 17 | Betty Canase | 24 | Grand daughter-in-law | — | Louisiana |
| 18 | Robert O Canase | 12 | Grand son | — | Louisiana |
| 19 | James M Hudson | 45 | Head | Sales Manager | Georgia |
| 20 | Elsie Hudson | 42 | Wife | — | Washington D.C. |
| 21 | William O Hudson | 22 | Son | — | Louisiana |
| 22 | Florence Hudson | 21 | Daughter | New Worker | Louisiana |
| 23 | Nancy Hudson | 20 | Daughter | — | Louisiana |
| 24 | Mary Weil | 69 | Head | Saleswoman | Louisiana |
| 25 | Helen N Weil | 60 | Wife | — | Louisiana |
| 26 | Louis A Lenaux | 45 | Head | Sugar Planter | Louisiana |
| 27 | Hilda G Lenaux | 48 | Wife | — | Louisiana |
| 28 | Alvin Lenaux | 18 | Son | Bookkeeper | Louisiana |
| 29 | Marie L Lenaux | 17 | Daughter | — | Louisiana |
| 30 | Pierre Lenaux | 15 | Son | — | Louisiana |
| 31 | Marsha Lenaux | 14 | Daughter | — | Louisiana |
| 32 | Hilaire Lenaux | 11 | Son | — | Louisiana |
| 33 | Louis A Jr Lenaux | 9 | Son | — | Louisiana |
| 34 | Leon Villere | 68 | Brother-in-law | — | Louisiana |
| 35 | Laura Villere | 63 | Sister | — | Louisiana |
| 36 | Aron Hirschwitz | 64 | Head | Manufacturer | Louisiana |
| 37 | Sadie C Hirschwitz | 58 | Wife | — | Louisiana |
| 38 | Thelma Hirschwitz | 32 | Daughter | — | Louisiana |
| 39 | Lester A Hirschwitz | 15 | Grand son | — | Louisiana |
| 40 | Simon Steiner | 45 | Lodger | Surgeon | Louisiana |
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)