MH
Mary Hennessy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Ramsey-County, Minnesota
Our Model Tree links this Mary Hennessy across the 1920, 1930 and 1940 US Censuses in Ramsey-County, Minnesota (XGBoost, ~Confirmed), with identified parents Fred & Fred — first a daughter (b.~1918), then head of a 3-person household.
Age 22
b. ~1918
Female
Daughter
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Ramsey-County, Minnesota |
| Surname | Hennessy |
| Given Name | Mary Jo |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | St Paul City |
| 1935 Residence (County) | Ramsey |
| Additional Details | |
| Occupation | Sales Clerk |
| Industry | Retail Department Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 850 |
| Highest Grade | C 2 |
| 1935 Residence | Minnesota |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Occupation | Sales Clerk |
| Township / Ward | St Paul City |
| Est. Birth Year | ~1918 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Hennessy | Daughter | — | 22 | ~1918 |
| Phoebe Hennessy | Spouse | — | 49 | ~1891 |
| Frederick Hennessy | Head | — | 51 | ~1889 |
Census Appearances
1920
Ramsey, Minnesota
Daughter, age 2
Ramsey, Minnesota · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessy |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
Daughter, age 12
Ramsey, Minnesota · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessey |
| Given Name | Mary Josephine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Ramsey-County, Minnesota
Daughter, age 22
Ramsey-County, Minnesota · implied b. ~1918 — 3 household members
| Surname | Hennessy |
| Given Name | Mary Jo |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | St Paul City |
| 1935 Residence (County) | Ramsey |
| Occupation | Sales Clerk |
| Industry | Retail Department Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 850 |
| Highest Grade | C 2 |
| 1935 Residence | Minnesota |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
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 Hennessy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Fred Hennessey (~0.92 confidence) and father Fred Hennessy (~0.92 confidence) and mother Phoebe Hennessy (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Fred Hennessey
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Fred Hennessy
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Phoebe Hennessy
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Hennessy
Daughter · 1940 · age 22 · b. ~1918 · Minnesota
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Ramsey-County, Minnesota
Open full size
1940 US Federal Census — Ramsey-County, Minnesota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01997-00253)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ruth E Miller | 14 | Daughter | — | Minnesota |
| 42 | William B Berlandi | 71 | Head | Meter Reader | Minnesota |
| 43 | Johanna Berlandi | 65 | Wife | — | Germany |
| 44 | John A Simpson | 34 | Son-in-law | Attendant | New York |
| 45 | Mildred M Simpson | 36 | Daughter | — | Minnesota |
| 46 | Rita M Simpson | 1 | Daughter | — | Minnesota |
| 47 | Joseph J Margette | 34 | Head | Baker | Wisconsin |
| 48 | Mary E Margette | 30 | Wife | — | Wisconsin |
| 49 | Joanne P Margette | 6 | Daughter | — | Minnesota |
| 50 | Geraldine M Margette | 1 | Daughter | — | Minnesota |
| 51 | Jordan Hutmacher | 67 | Head | Porter | Russia |
| 52 | Mary Hutmacher | 62 | Wife | — | Austria |
| 53 | Dora E Walther | 67 | Head | — | Minnesota |
| 54 | Gertrude F Walther | 31 | Daughter | Cashier | Minnesota |
| 55 | Felicia E Walther | 26 | Daughter | Clerk | Minnesota |
| 56 | Frank Telker | 60 | Head | Grinder | Minnesota |
| 57 | Elsie H Telker | 54 | Wife | Servant | Germany |
| 58 | Margaret E Telker | 27 | Daughter | Stenographer | Minnesota |
| 59 | Hugo Hendricks | 52 | Lodger | Attorney | Germany |
| 60 | William C Brayman | 57 | Head | Carpenter | Minnesota |
| 61 | Mary Brayman | 52 | Wife | — | Minnesota |
| 62 | Bernard Wagener | 15 | Step-son | — | Minnesota |
| 63 | Helen Wagener | 31 | Step-daughter | Elevator Operator | Minnesota |
| 64 | Charles Wagener | 28 | Step-son | Proprietor | Minnesota |
| 65 | Robert Winkel | 5 | Lodger | — | Minnesota |
| 66 | John H Cowley | 54 | Head | Locomotive Fireman | Pennsylvania |
| 67 | Augusta M Cowley | 55 | Wife | — | Wisconsin |
| 68 | John H Cowley | 20 | Son | Clerk | Minnesota |
| 69 | Philip J Cowley | 18 | Son | New Worker | Minnesota |
| 70 | George E Maier | 37 | Head | Cashier | Russia |
| 71 | Luella K Maier | 30 | Wife | — | South Dakota |
| 72 | John Mcewan | 69 | Head | — | Minnesota |
| 73 | Bridget Mcewan | 67 | Wife | — | Eire |
| 74 | Ray M Martindell | 46 | Head | Cashier | Minnesota |
| 75 | Ethel G Martindell | 43 | Wife | — | Minnesota |
| 76 | Lorraine R Martindell | 20 | Daughter | File Clerk | Minnesota |
| 77 | Raymond H Martindell | 18 | Son | — | Minnesota |
| 78 | Frederick H Hennessy | 51 | Head | Bookkeeper | Minnesota |
| 79 | Phoebe J Hennessy | 49 | Wife | — | Minnesota |
| 80 | Mary Jo Hennessy THIS PERSON | 22 | Daughter | Sales Clerk | Minnesota |
Related Census Records
Pedigree Summary
Mary
Gen 1 · 3 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)