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Refer to the appropriate community number when you have questions concerning a Flat FIRM or non, countywide Hold FIRM or when you order one of those types of maps tram the Flood Map Distribution Center (see Appendix A). Community numbers also appear on countywide FIRMs. However, when you have a question about a countywide FIRM or when you order one, you should refer to the map number (see Item G), C, Listing of Communities (Countywide FIRMs Onlyl Identifies all communities covered by the FIRM, their NFIP identification numbers, the panel or panels on which each community is shown, and the Initial Identification Date (see "Key Elements of the FIRM Panel," Item 31) and Post, FIRM Date for each community, The Post,FIRM Date for a community is the effective date of the first FIRM published for that community, When a countywide FIRM becomes effective, it supersedes all previous versions of FEMA flood hazard maps for the communities it covers. 0, List of Printed Panels (Hold FIRMs Only) Identifies those panels, out of the total number shown in the body of the Index, that are printed. The layout of a multiple, panel FIRM allows for map coverage of the entire community, However, when a panel covers an area of the community that falls entirely within one flood insurance zone, that panel is not printed and an explanatory note is added to the body of the I ndex (see Item L). E, List of Community,Panel Numbers (Non'countywide Hold FIRMs Onlyl Indicates the total number of panels in the layout of the FIRM, including both printed and unprinted panels, Each panel is identified by a ten,digit com, munity,panel number, which is com, posed of the six,digit NFIP identification number for the mapped community (see Item B) and a four,digit panel number. F, Key to Map (Flat FIRMs Only) Map legend that identifies the symbols that appear on the map and provides information about the map. The legend does not appear on individual Flat FIRM panels, For Hold FIRMs, a similar legend is shown on each FIRM Panel. You may therefore refer to the section entitled "Key Elements of the Hold FIRM Panel" for an explanation of the information that appears in the Key to Map (see Figure 7, "Panel Legend"). G, Map Number {Countywide FIRMs OnlYI Identifies the FIRM, Because a countywide FIRM covers more than one community, the map number cannot be based on the six,digit NFIP community identification number (see Item B) for either the county or any of its incorporated communities, Instead the map number is composed of a two,digit state code; a three,digit county code; the letter "C;' which indicates that the FIRM has been prepared in the countywide format; and four zeros, H, Panel Limit Line Shows the extent of the area covered by the panel. I. Corporate Limit or County Boundary Line Identifies the jurisdictional limits within which the mapped community has regulatory authority over development. In some states, an incorporated