Guadalajara District/City Limits

I was looking for my grandmother's civil birth record on microfilm for the
Guadalajara District, because my mother had said her mother was born in
Guadalajara on May 25th, 1907. However, I didn't find my grandmother's
birth record. My mother said that her mother's family, Alberto and
Francisca Martin del Campo, lived on a farm in Guadalajara and that was
where her mother was born. So, I just got my Jalisco map in the mail and I
have been checking for a listing of the municipios in Jalisco and see that
Guadalajara is both a city and a district, or municipio, all in itself. Am
I understanding that correctly? Like in California, San Francisco is both a
city and a county. So, now I'm thinking that, if they lived on a farm a
hundred years ago, that farm may not even be there anymore. It may now be
city. What I'm wondering is if cities in Mexico have city limits, like they
do here and, if so, I'm wondering if the Guadalajara city limits have been
expanded as the city has grown. What I'm trying to determine is that the
reason my grandmother's birth record was not in the Guadalajara district
civil registry, is perhaps because even though they lived "in Guadalajara,"
it may have been in another district, at least back in 1907 when my
grandmother was born. Would anyone know about this? My mother is going to
call her aunt to ask where the family farm was, but she may not know about
any boundary changes that may have occurred. I hope all of this makes
sense, basically I'm trying to determine which district my grandmother was
born in, so I can then order the microfilm for that one and, hopefully, find
her birth record in it.

Corrine Ardoin