DM
David Murphy — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this David Murphy across the 1920, 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents Joseph & Thomas — first a daughter (b.~1910), then head of a 4-person household.
Age 20
b. ~1910
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Murphy |
| Given Name | David L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | salesgirl |
| Industry | 5 & 10 store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Salesgirl |
| Township / Ward | Lowell City |
| Est. Birth Year | ~1910 |
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.
4 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to David | Age | Birth yr |
|---|---|---|---|---|
| Mary Murphy | Other | — | 46 | ~1884 |
| Thomas Murphy | Head | — | 46 | ~1884 |
| John Murphy | Son | — | 22 | ~1908 |
| David Murphy | Daughter | — | 20 | ~1910 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 10
Middlesex, Massachusetts · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Murphy |
| Given Name | Doris |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 20
Middlesex, Massachusetts · implied b. ~1910 — 4 household members
| Surname | Murphy |
| Given Name | David L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | salesgirl |
| Industry | 5 & 10 store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 29
Middlesex-County, Massachusetts · implied b. ~1911 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Murphy |
| Given Name | Daisy |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Malden |
| 1935 Residence (County) | Middlesex |
| Occupation | Typist |
| Industry | Rubber Co. |
| Class of Worker | PW |
| Hours Worked | 28 |
| Income (1939) | 600 |
| Highest Grade | H-3 |
| 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 David Murphy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Murphy (~0.92 confidence) and father Thomas Murphy (~0.92 confidence) and mother Mary Murphy (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Murphy
b. ~1881
Source father
● Household
· direct · ~0.92
Father
Thomas Murphy
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Mary Murphy
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
David Murphy
Daughter · 1930 · age 20 · b. ~1910 · Massachusetts
★ You are viewing this record
Sibling
John Murphy
Sibling · 1930 · age 22
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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel922:0632)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Peter J Hartigan | 36 | Head | Policeman | Massachusetts |
| 52 | Annie Hartigan | 31 | Wife-H | None | Massachusetts |
| 53 | Wm L Risley | 40 | Head | Brakeman | Massachusetts |
| 54 | Isabella Risley | 40 | Wife-H | None | Massachusetts |
| 55 | Thomas R Murphy | 46 | Head | Engineer | Massachusetts |
| 56 | Mary J Murphy | 46 | Wife-H | None | Massachusetts |
| 57 | John J Murphy | 22 | Son | Apprentice | Massachusetts |
| 58 | David L Murphy THIS PERSON | 20 | Daughter | Salesgirl | Massachusetts |
| 59 | George A Mcelroy | 78 | Head | None | Irish Free State |
| 60 | Mary Mcelroy | 70 | Wife-H | None | Northern Ireland |
| 61 | Mary Blackstock | 59 | Housekeeper | Housekeeper | Northern Ireland |
| 62 | Claude R Mcelroy | 31 | Head | Chauffeur | Massachusetts |
| 63 | Marion R Mcelroy | 35 | Wife-H | None | New Hampshire |
| 64 | June F Mcelroy | 10 | Daughter | None | Massachusetts |
| 65 | Gerald A Mcelroy | 8 | Son | None | Massachusetts |
| 66 | George R Mcelroy | 5 | Son | None | Massachusetts |
| 67 | Arthur R Mcelroy | 3 | Son | None | Massachusetts |
| 68 | Barbara A Mcelroy | 1 | Daughter | None | Massachusetts |
| 69 | John J Mahoney | 53 | Head | Barber | Massachusetts |
| 70 | Mary A Mahoney | 53 | Wife-H | None | Massachusetts |
| 71 | Dorothy A Mahoney | 22 | Daughter | Teacher | Massachusetts |
| 72 | Charles W Mahoney | 16 | Son | None | Massachusetts |
| 73 | Mary R Mahoney | 12 | Daughter | None | Massachusetts |
| 74 | Sarah Joyce | 76 | Head-H | None | England |
| 75 | John J Joyce | 46 | Son | Carpenter | Massachusetts |
| 76 | John J Malley | 52 | Head | Signal Man | Massachusetts |
| 77 | Winifred M Malley | 51 | Wife-H | None | Massachusetts |
| 78 | John J Jr Malley | 18 | Son | None | Massachusetts |
| 79 | Barbara J Malley | 15 | Daughter | None | Massachusetts |
| 80 | Charles C Dulligan | 44 | Brother | Mechanic | Massachusetts |
| 81 | Catherine D Dulligan | 29 | Sister | Secretary | Massachusetts |
| 82 | Margaret M Mullane | 60 | Head-H | None | Irish Free State |
| 83 | Mary C Mullane | 37 | Daughter | Bookkeeper | Massachusetts |
| 84 | Dennis P Mullane | 31 | Son | Clerk | Massachusetts |
| 85 | Daniel J Mullane | 30 | Son | Office Clerk | Massachusetts |
| 86 | Patrick J Mullane | 29 | Son | Dentist | Massachusetts |
| 87 | Philip C Mullane | 27 | Son | None | Massachusetts |
| 88 | Helen A Royal | 32 | Daughter | None | Massachusetts |
| 89 | Mary P Royal | 9 | Daughter | None | Massachusetts |
| 90 | Marguerite R Royal | 7 | Daughter | None | Massachusetts |
| 91 | Hulda Boren | 61 | Head-H | None | Sweden |
| 92 | Harold H Rodger | 8 | Grandson | None | Massachusetts |
| 93 | Dana D Calvert | 37 | Head | Dyer | Idaho |
| 94 | Phoebe M Calvert | 31 | Wife-H | None | Massachusetts |
| 95 | Ruth C Calvert | 9 | Daughter | None | Massachusetts |
| 96 | Edwin J Calvert | 6 | Son | None | New Jersey |
| 97 | Timothy J Sheridan | 29 | Head | Spinner | Massachusetts |
| 98 | Catherine C Sheridan | 29 | Wife | Inspector | Massachusetts |
| 99 | Timothy J Jr Sheridan | 5 | Son | None | Massachusetts |
| 100 | Flora Sheridan | 65 | Mother-H | None | Irish Free State |
Pedigree Summary
David + 1 sibling
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 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)