The standard size for hospital beds is almost always standard twin extra long size. An extra length extension is usually available for most bed models. A hospital bed can MHA thanks Lincare Inc. and our other associate members for their support. Minnesota Hospital Association 2550 University Ave. W., Suite 350-S St. Paul, MN 55114 Hospital Size and Location. Washington hospitals are relatively small. Most hospitals in Washington State have fewer than 100 beds.