JB
James Blair — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this James Blair across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Warren & Lottie — first a head (b.~1891), then head of a 4-person household.
Age 49
b. ~1891
Male
Head
Born: Maine
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Blair |
| Given Name | James R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Maine |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Clerk |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 39 |
| Income (1939) | 2196 |
| Highest Grade | C-4 |
| 1935 Residence | Same house |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
| Occupation | Clerk |
| Township / Ward | Medford City |
| Est. Birth Year | ~1891 |
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 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Blair | Head | — | 49 | ~1891 |
| Daniel Blair | Son | — | 10 | ~1930 |
| Betsy Blair | Daughter | — | 12 | ~1928 |
| Susan Blair | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 27
Middlesex, Massachusetts · implied b. ~1893 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | James R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Maine |
| Father's Birthplace | Maine |
| Mother's Birthplace | Maine |
| Occupation | Assistant |
| Industry | Bank |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
1930
Middlesex, Massachusetts
Head, age 38
Middlesex, Massachusetts · implied b. ~1892 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | James R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Maine |
| Age at First Marriage | 31 |
| Father's Birthplace | Maine |
| Mother's Birthplace | Maine |
| Occupation | Coupon Teller |
| Industry | National Bank |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | WW |
| Home Value / Rent | R |
| Radio Set | 4000 |
| Veteran | Yes |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
1940
Middlesex-County, Massachusetts
Head, age 49
Middlesex-County, Massachusetts · implied b. ~1891 — 4 household members
| Surname | Blair |
| Given Name | James R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Maine |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Occupation | Clerk |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 39 |
| Income (1939) | 2196 |
| Highest Grade | C-4 |
| 1935 Residence | Same house |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
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 James Blair across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Warren Blair (~0.92 confidence) and mother Lottie Blair (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Warren Blair
b. ~1863
Source father
● Household
· direct · ~0.92
Mother
Lottie Blair
b. ~1868
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Blair
Head · 1940 · age 49 · b. ~1891 · Massachusetts
★ 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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
36 people indexed on this census page (nara:1940:m-t0627-01611-00547)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward C. Stephenson | 51 | Head | Manager | Mass. |
| 42 | Helen E. Stephenson | 50 | Wife | — | Mass. |
| 43 | Edward Jr. Stephenson | 25 | Son | Manager | Mass. |
| 44 | Ellamay Stephenson | 22 | Daughter-in-law | — | Mass. |
| 45 | Douglas Stephenson | 2 | Grandchild | — | Mass. |
| 47 | Elsie G. Welch | 53 | Head | School Nurse | Mass. |
| 48 | Gertrude B. Welch | 77 | Mother | — | Mass. |
| 49 | Cyrus A. Little | 45 | Lodger | Plumber | Mass. |
| 50 | George P. Lord | 39 | Head | Master Mariner | Mass. |
| 51 | Gladys H. Lord | 40 | Wife | — | Pennsylvania |
| 52 | James R. Blair THIS PERSON | 49 | Head | Clerk | Maine |
| 53 | Susan E. Blair | 48 | Wife | — | Mass. |
| 54 | Betsy A. Blair | 12 | Daughter | — | Mass. |
| 55 | Daniel W. Blair | 10 | Son | — | Mass. |
| 57 | Pius Sabra | 41 | Head | Manager | Italy |
| 58 | Mary T. Sabra | 35 | Wife | Waitress | Mass. |
| 59 | Joseph T. Sabra | 15 | Son | — | Mass. |
| 60 | Lois M. Lyons | 14 | Stepdaughter | — | Mass. |
| 61 | William C. Hamilton | 39 | Head | Manager | Mass. |
| 62 | Anne L. Hamilton | 40 | Wife | — | Mass. |
| 63 | Charles L. Hamilton | 15 | Son | — | Mass. |
| 64 | Mary Ann Hamilton | 10 | Daughter | — | Mass. |
| 65 | William C. Jr. Hamilton | 7 | Son | — | Mass. |
| 66 | Rose Mcmillan | 55 | Servant | Maid | Mass. |
| 67 | Francis A. Thompson | 28 | Head | Vocational Teacher | Mass. |
| 68 | Eleanor M. Thompson | 31 | Wife | — | Mass. |
| 69 | Elsie B. Tolan | 51 | Mother-in-law | — | Mass. |
| 72 | John Lynch | 43 | Head | Manager | Eire |
| 73 | Caroline F. Lynch | 46 | Wife | — | Mass. |
| 74 | John Lynch | 14 | Son | — | Mass. |
| 75 | Robert Lynch | 11 | Son | — | Mass. |
| 76 | Donald Lynch | 7 | Son | — | Mass. |
| 77 | Evelyn Anderson | 43 | Head | — | Wisconsin |
| 78 | Thomas Anderson | 20 | Son | — | Wisconsin |
| 79 | Kenneth Mckillop | 41 | Head | Accountant | Mass. |
| 80 | Mildred Mckillop | 36 | Wife | — | Mass. |
Pedigree Summary
James
Gen 1 · 2 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)