Each panel has a panel number and community number. When there is only 1 panel (i.e., a flat map), the community number will consist of only 6 digits.
Example: Monterey County, CA 060195-1025 (The first 2 digits of the number identify the state and the next 4 digits identify the community. The last 4 digits identify the map panel.).
400484 = Leflore County
https://www.fema.gov/cis/OK.html If you are doing your own determination, then yes, you have to check for any Letter of Map Change (LOMC) (these include the Letter of Map Amendment (LOMA), Letter of Map Revision (LOMR) or similar FEMA Map Letter(s)) applies to the subject property and indicate as appropriate.
Detailed instructions on completing the form can be found here:
https://www.fema.gov/media-library-data/..._32_06_2016.pdfAt approx. $8 a pop for a getting a SFHDF from a vendor that also includes an indemnity to the bank and the customer for errors, I am not sure why a bank would choose to do this themselves.