The Block

The substitutes: where Chicago's answers actually live

PUBLISHED 1 SEPTEMBER 2026

When the record you want does not exist, some other office usually recorded the same fact for a reason of its own. Knowing which office, and why it cared, is the difference between a line that stops and a line that continues.

Genealogy in a city that lost its paper is a discipline of substitutes. The county birth record is gone; something else recorded that birth, or recorded a fact that implies it, because somebody needed it for a purpose that had nothing to do with genealogy.

That last part is the trick. A substitute is not a copy of the lost record. It is a different record made by someone with their own reason to write the fact down, and its reliability depends entirely on what that reason was.

Birth

Baptismal registers. The strongest substitute in this city. A parish recorded the baptism because the sacrament required it, close to the event, from information given by the family. Catholic registers name godparents, who are usually relatives, and frequently the mother's maiden name.

Delayed birth certificates. Filed decades later, often in the 1930s and 1940s, when Social Security required proof of age. The applicant had to submit supporting evidence, and that evidence is in the file. A delayed certificate is worth pulling for its attachments more than for the certificate.

School records. An enrolment card carries a birth date and a parent's name, recorded by a clerk with no stake in the answer.

A census of the right year. The 1900 federal census gives a birth month and year. It is the only one that does, and it is worth more than the age columns of every other year put together.

Marriage

Parish marriage registers, which name both parties' parents far more often than the civil record did.

Newspaper notices, which name the church, the officiant and the attendants — and the attendants are frequently siblings.

Later records that state the marriage: a probate file identifying a widow, a pension application requiring proof of marriage, a death certificate naming a spouse.

Death

Cemetery and burial records. Independent of the county, kept by the cemetery for its own management, and often naming the plot owner — who is a relative, and who is a lead in their own right.

Undertakers' registers, where they survive, which give the informant.

Probate, which names heirs and their relationships, and does so under legal pressure to be accurate.

Obituaries, which name survivors and, crucially, where those survivors had moved to.

Residence, occupation and everything else

City directories, published annually, listing name, occupation and address. Run consecutively they produce a year-by-year track of a household, and the year a name disappears is worth noticing.

Fire insurance atlases, which describe the building rather than the family, and settle what kind of household it could have been.

Naturalization, filed in whichever court was convenient — federal, state or county. After September 1906 the declarations and petitions carry a great deal: date and place of birth, port and date of arrival, the ship, the spouse and children.

Institutional admission records. Orphanages, children's homes, hospitals, benevolent and mutual-aid societies. These are the ones most often missed, because they are catalogued under the institution and not under a surname. Reaching them means identifying the right institution and asking the archive that holds it a specific question.

How to judge a substitute

A substitute is only as good as the reason it was made. Three questions settle it:

1. Who supplied the information, and how did they know? A death certificate's birth date comes from a grieving relative, sometimes a neighbour. Its death date comes from a physician. Those two facts on one certificate carry entirely different weight.
2. How far from the event was it recorded? A baptism recorded within a week outranks an age given to a census taker thirty years later.
3. What was at stake? A pension file was scrutinised by a government determined not to pay. A directory listing was taken at the door by a canvasser paid by the entry.

Two substitutes that agree, made independently and for different reasons, are stronger than one original.

That is the standard the work runs to, and it is why a research log records the searches that found nothing. A negative result in a well-chosen substitute tells you something real: not that the record is missing, but that the family was not where you thought they were.

Working on a Chicago family and stuck on something like this? Start a conversation — the first one is free.