Data without state FIPS code

[phuang5]

Hi Matt,
Thanks for posting this useful data! I notice that in the processed data, there are rows whose origin/destination have three digits, without their state FIPS codes. A quick eyeballing suggests that those rows typically only have nonzero entries for the year of 1998. Do you have an idea about what those counties may be?
Here is a short script to extract those rows:

irs <- read.table("IRS-migration-data/DATA-PROCESSED/county_migration_data.txt",
                    header = T)
no.state.fips <-  floor(irs$origin/1e3)==0 | floor(irs$destination/1e3)==0
table(no.state.fips)
head(irs[no.state.fips,])