Morrisville is in southern Bucks County, right next to Trenton, NJ.
Morrisville Fire Co has an FCC license:
MORRISVILLE FIRE COMPANY WQJS420 460.38750 1 0 FB PW MORRISVILLE
MORRISVILLE FIRE COMPANY WQJS420 460.38750 30 0 MO PW MORRISVILLE
MORRISVILLE FIRE COMPANY WQJS420 460.38750 1 0 FB PW
MORRISVILLE FIRE COMPANY WQJS420 460.38750 30 0 MO PW
The Borough of Morrisville also has an FCC license:
BOROUGH OF MORRISVILLE WPSQ527 158.84250 1 0 FB PW MORRISVILLE
BOROUGH OF MORRISVILLE WPSQ527 158.84250 25 0 MO PW MORRISVILLE
BOROUGH OF MORRISVILLE WPSQ527 158.84250 1 0 FB PW
BOROUGH OF MORRISVILLE WPSQ527 158.84250 25 0 MO PW
Neither frequency has been submitted as confirmed in use to the database.
If you hear traffic on them, submit them as in use. If you can, get the CTCSS or DCS tone if there is one. Remember that the listing in the database is not all inclusive. You need to also check the FCC data. There is a tab on the county database pages for "FCC Licenses" and you can find all the FCC data there. Once somebody makes a submission confirming these frequencies are in use, it can be added in to the database.
Also, a question like this might be best suited for the Pennsylvania forum since you will have more locals seeing it there than here.