Relevant NAICS and SIC codes for this industry include those related to ski resorts and to ski and snowboard stores as listed below:
CODES FOR SKI RESORTS:
NAICS 713920: Skiing Facilities
NAICS 721110: Hotels (except Casino Hotels) and Motels ; SIC 7011: Hotels and Motels (which includes Ski lodges and resorts)
CODES FOR SKI AND SNOWBOARD STORES:
NAICS 451110: Sporting Goods Stores ; SIC 5941: Sporting Goods Stores and Bicycle Shops
CODES ON THE MANUFACTURING SIDE FOR SNOW RELATED SPORTING GOODS:
NAICS 339920: Sporting and Athletic Goods Manufacturing ; SIC 3949: Sporting and Athletic Goods, Not Elsewhere
It is important to know these codes in order to retrieve statistical information produced by the Census as well as search certain databases by these codes.
The ski industry is part of the overall hospitality / leisure recreation industries. Further information might be available if you expand your search to these broader industries.
One source you can use to apply NAICS codes is the Business Patterns database from the U.S. Census Bureau. This can help you determine what has been the trend in a particular industry from a National, County, Metro, and Zip Code perspective. Please note, however, that this will probably not include those establishments that are purely web-based.
You can also use NAICS and SIC codes to find Industry reports from First Research.
The links below will help you find other relevant codes you may want to identify. You can also find NAICS and SIC codes by looking at the industry information for a company in a database like Mergent Intellect.