Finding error in long input file

I've a file with 488 rows to be input into a table. I run the script using
psql with the `\i' option.

After psql found a few missing commas I thought the script was clean. But,
psql returned this error:
bustrac=# \i scripts/insert-addrs.sql
psql:scripts/insert-addrs.sql:488: ERROR: syntax error at or near ";"
LINE 488: ...2832,1,default,'85250 Red House Rd','Paisley','OR','97636');
^ Am
I correct that some rows were inserted into the table before this error was
generated somewhere prior to the end of the file? If so, how do I determine
which rows were inserted and what is the recommended procedure to locate
just where that error is?

I've learned from experience that using the old coding approach of dividing
the file in half, then half again and again until the row with the error is
found produces multiple rows with different PKs. Not what I want to clean
up.

A clue stick will be much appreciated.

TIA,

Rich