This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. Each of the State of Maryland's 1 - 406 2010 census tracts was analyzed to determine whether it represented a typical census tract as defined by the U. S. Bureau of the Census. Nationally these are census tracts that optimally are 4 - 000 inhabitants but generally range from 1 - 200 to 8 - 000 persons. In Maryland the average census tract contains 4 - 106 persons. Nationally the housing unit threshold for each census tract generally ranges from 480 to 3 - 200 housing units - with an optimum size of 1 - 600 housing units. In Maryland the average census tract contains 1 - 692 housing units. The Emergency Management Planning Database and the Emergency Planning Vulnerable Population Index are intended to assist State agency emergency officials plan tactics - develop strategies - allocate resources and prioritize responses for emergencies and to identify potentially vulnerable population areas for special attention. Statewide - there are 222 census tracts containing persons at 'Very High' socio - economic risk or vulnerability in the event of an emergency. 'Very High'� risk census tracts account for 16 - percent of the State's 1 - 390 specified census tracts. These census tracts are located throughout the State in 20 of 24 jurisdictions. There are 773 - 808 persons living in these areas making up 13.4 percent of the State's 2010 Census population of 5 - 773 - 552 persons. Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/PublicSafety/MD_VeryHighRiskCensusTracts/FeatureServer/0 ADDITIONAL LICENSE TERMS: The Spatial Data and the information therein (collectively "the Data") is provided "as is" without warranty of any kind either expressed implied or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct indirect incidental consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.