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William Brennan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Essex, Massachusetts
Our Model Tree links this William Brennan across the 1930 and 1940 US Censuses in Essex, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1875), then head of a 9-person household.
Age 55
b. ~1875
Male
Head
Born: Irish Free State
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Essex, Massachusetts |
| Surname | Brennan |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| Naturalization Status | Naturalized |
| Year of Immigration | 1907 |
| Age at First Marriage | 35 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Occupation | Stationary fireman |
| Industry | Elec appl factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 2500 |
| Veteran | Yes Sp |
| Birthplace (normalized) | irish free state |
| Occupation | Stationary Fireman |
| Township / Ward | Lynn City |
| Est. Birth Year | ~1875 |
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 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| John Brennan | Son | — | 20 | ~1910 |
| Robert Brennan | Son | — | 10 | ~1920 |
| Anne Brennan | Daughter | — | 8 | ~1922 |
| William Brennan | Son | — | 18 | ~1912 |
| Bridget Brennan | Other | — | 48 | ~1882 |
| Mary Brennan | Daughter | — | 4 | ~1926 |
| James Brennan | Son | — | 16 | ~1914 |
| Michael Brennan | Son | — | 14 | ~1916 |
| William Brennan | Head | — | 55 | ~1875 |
Census Appearances
1930
Essex, Massachusetts
Head, age 55
Essex, Massachusetts · implied b. ~1875 — 9 household members
| Surname | Brennan |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| Naturalization Status | Naturalized |
| Year of Immigration | 1907 |
| Age at First Marriage | 35 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Stationary fireman |
| Industry | Elec appl factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 2500 |
| Veteran | Yes Sp |
| Birthplace (normalized) | irish free state |
1940
Middlesex-County, Massachusetts
Other, age 66
Middlesex-County, Massachusetts · implied b. ~1874 — 30 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | William |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Single |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Lowell |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Occupation | Laborer |
| Industry | W.P.A. project |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | G 4 |
| 1935 Residence | Same place |
| Birthplace (normalized) | irish free state |
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 Brennan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Brennan
Head · 1930 · age 55 · b. ~1875 · Massachusetts
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Essex, Massachusetts
Open full size
1930 US Federal Census — Essex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel900:0578)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Stefia Radulski | 35 | Wife-H | Tacker | Poland |
| 52 | Walter J Radulski | 16 | Son | Clerk | Massachusetts |
| 53 | Helen Radulski | 14 | Daughter | — | Massachusetts |
| 54 | Irene Radulski | 11 | Daughter | — | Massachusetts |
| 55 | Teofil Olszewski | 43 | Head | Glazer | Poland |
| 56 | Anka Olszewski | 42 | Wife-H | — | Pennsylvania |
| 57 | Agnes Olszewski | 19 | Daughter | Tacker | Pennsylvania |
| 58 | Francis Olszewski | 18 | Son | Feeder | Pennsylvania |
| 59 | Mary Olszewski | 13 | Daughter | — | Massachusetts |
| 60 | Joseph Olszewski | 7 | Son | — | Massachusetts |
| 61 | Edward Olszewski | 4 | Son | — | Massachusetts |
| 62 | Isaac F Walczak | 41 | Head | Glazer | Poland |
| 63 | Sadie J Walczak | 17 | Daughter-H | — | Massachusetts |
| 64 | Edward Walczak | 15 | Son | — | Massachusetts |
| 65 | William Brennan THIS PERSON | 55 | Head | Stationary Fireman | Irish Free State |
| 66 | Bridget A Brennan | 48 | Wife-H | — | Irish Free State |
| 67 | John J Brennan | 20 | Son | — | Massachusetts |
| 68 | William H Brennan | 18 | Son | Glazer | Massachusetts |
| 69 | James P Brennan | 16 | Son | — | Massachusetts |
| 70 | Michael Brennan | 14 | Son | — | Massachusetts |
| 71 | Robert Brennan | 10 | Son | — | Massachusetts |
| 72 | Anne Brennan | 8 | Daughter | — | Massachusetts |
| 73 | Mary Brennan | 4 | Daughter | — | Massachusetts |
| 74 | Patrick J Hardy | 33 | Head | Machinist | Irish Free State |
| 75 | Anna M Hardy | 29 | Wife-H | — | Irish Free State |
| 76 | John W Hardy | 2 | Son | — | Massachusetts |
| 77 | James M Hardy | 1 | Son | — | Massachusetts |
| 78 | Tessie Lacouras | 50 | Head-H | — | Greece |
| 79 | Charles Lacouras | 17 | Son | — | Massachusetts |
| 80 | John Lacouras | 15 | Son | — | Massachusetts |
| 81 | Margaret Lacouras | 14 | Daughter | — | Massachusetts |
| 82 | Harry Lacouras | 13 | Son | — | Massachusetts |
| 83 | George Lacouras | 11 | Son | — | Massachusetts |
| 84 | Christine Lacouras | 8 | Daughter | — | Massachusetts |
| 85 | Spiro Lacouras | 7 | Son | — | Massachusetts |
| 86 | Arthur Bouras | 35 | Head | Laundry Work | Greece |
| 87 | Beatrice Bouras | 38 | Wife-H | — | Greece |
| 88 | Constantine Bouras | 10 | Daughter | — | Massachusetts |
| 89 | John Bouras | 8 | Son | — | Massachusetts |
| 90 | Theodore Bouras | 5 | Son | — | Massachusetts |
| 91 | Christie Bouras | 2 | Son | — | Massachusetts |
| 92 | Tony Gingopoulos | 46 | Head | Laborer | Greece |
| 93 | Beatrice Gingopoulos | 43 | Wife-H | — | Greece |
| 94 | Nicholas Gingopoulos | 18 | Son | Messenger | Greece |
| 95 | Charles Gingopoulos | 16 | Son | — | Greece |
| 96 | James Gingopoulos | 12 | Son | — | Massachusetts |
| 97 | Harry Gingopoulos | 9 | Son | — | Massachusetts |
| 98 | Stella Gingopoulos | 7 | Son | — | Massachusetts |
| 99 | Viola Gingopoulos | 4 | Daughter | — | Massachusetts |
| 100 | Thiel Gingopoulos | 2 | Son | — | Massachusetts |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)