WF
William Flynn — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this William Flynn across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents William & Kathryn — first a son (b.~1918), then head of a 7-person household.
Age 22
b. ~1918
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Flynn |
| Given Name | William P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | BOSTON |
| 1935 Residence (County) | SUFFOLK |
| Additional Details | |
| Occupation | Draftsman |
| Industry | Machinery Mfg. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 150 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Draftsman |
| Township / Ward | Boston |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Ethel Flynn | Daughter | — | 11 | ~1929 |
| Mary Flynn | Daughter | — | 24 | ~1916 |
| William Flynn | Head | — | 56 | ~1884 |
| Rose Reilly | Other | — | 43 | ~1897 |
| William Flynn | Son | — | 22 | ~1918 |
| John Flynn | Son | — | 20 | ~1920 |
| Kathryn Flynn | Spouse | — | 51 | ~1889 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 1
Suffolk, Massachusetts · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Flynn |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 12
Suffolk, Massachusetts · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Flynn |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 22
Suffolk-County, Massachusetts · implied b. ~1918 — 7 household members
| Surname | Flynn |
| Given Name | William P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | BOSTON |
| 1935 Residence (County) | SUFFOLK |
| Occupation | Draftsman |
| Industry | Machinery Mfg. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 150 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Flynn across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Flynn (~0.92 confidence) and mother Kathryn Flynn (~0.92 confidence) and father Charles Flynn (~0.92 confidence) and mother Alice Flynn (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Flynn
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Kathryn Flynn
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Charles Flynn
b. ~1894
Source father
● Household
· direct · ~0.92
Mother
Alice Flynn
b. ~1897
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Flynn
Son · 1940 · age 22 · b. ~1918 · Massachusetts
★ You are viewing this record
Sibling
Ethel Flynn
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Flynn
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Flynn
Sibling · 1940 · age 20
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01680-00345)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Estelle M Boggie | 18 | Daughter | — | Massachusetts |
| 42 | Albert W Boggie | 14 | Son | — | Massachusetts |
| 43 | Edward C Mcgrath | 59 | Head | Editor | Massachusetts |
| 44 | Mary E Mcgrath | 52 | Wife | — | Massachusetts |
| 45 | Edward G Mcgrath | 18 | Son | — | Massachusetts |
| 46 | Nicholas Demakeles | 42 | Head | Shoe Repairing | Greece |
| 47 | Katherine Demakeles | 40 | Wife | — | Ireland |
| 48 | Louis R Demakeles | 17 | Son | — | Massachusetts |
| 49 | Joseph H Magennis | 45 | Head | Sanitary Insr | Ireland |
| 50 | Anna B Magennis | 34 | Wife | — | Irish Free State |
| 51 | Margaret Magennis | 10 | Daughter | — | Massachusetts |
| 52 | Joseph F Magennis | 6 | Son | — | Massachusetts |
| 53 | James P Magennis | 5 | Son | — | Massachusetts |
| 54 | Anna J Magennis | 3 | Daughter | — | Massachusetts |
| 55 | John F Magennis | 0 | Son | — | Massachusetts |
| 56 | John O'Hara | 38 | Son-in-law | Laborer | Irish Free State |
| 57 | Berthold G Albrecht | 35 | Head | Cabinet Maker | Massachusetts |
| 58 | Gertrude Albrecht | 30 | Wife | — | Massachusetts |
| 59 | Ernest T Lent | 73 | Head | Clerk | Canada-English |
| 60 | Florence Lent | 69 | Wife | — | New York |
| 61 | William H Flynn | 56 | Head | Bar Keeper | Massachusetts |
| 62 | Kathryn F Flynn | 51 | Wife | — | Irish Free State |
| 63 | Mary H Flynn | 24 | Daughter | Nurse-Reg. | Massachusetts |
| 64 | William P Flynn THIS PERSON | 22 | Son | Draftsman | Massachusetts |
| 65 | John F Flynn | 20 | Son | New Worker | Massachusetts |
| 66 | Ethel R Flynn | 11 | Daughter | — | Massachusetts |
| 67 | Rose E Reilly | 43 | Sister-in-law | Nurse-Reg | Massachusetts |
| 68 | John F Price | 59 | Head | Driver | Irish Free State |
| 69 | Mary J Price | 53 | Wife | — | Irish Free State |
| 70 | Mary A Price | 24 | Daughter | Secretary | Massachusetts |
| 71 | Peter Henrikson | 54 | Head | Laborer | Sweden |
| 72 | Margaret H Henrikson | 44 | Wife | — | England |
| 73 | Mary M Henrikson | 22 | Daughter | Clerk | Massachusetts |
| 74 | Stephen A Earner | 24 | Head | Repair Man | Massachusetts |
| 75 | Clara Earner | 27 | Wife | Saleslady | Massachusetts |
| 76 | Alfred L Nardini | 59 | Head | Manager | Italy |
| 77 | Bernice Nardini | 39 | Wife | — | Canada-English |
| 78 | Assunta M Nardini | 15 | Daughter | — | Massachusetts |
| 79 | Alfred L Jr Nardini | 7 | Son | — | Massachusetts |
| 80 | Catherine Snyder | 45 | Sister-in-law | Waitress | Canada-English |
Pedigree Summary
William + 3 siblings
Gen 1 · 4 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)