Nashua, New Hampshire, comes in as the safest on WalletHub's list; St. Louis ranks last
                                
                                
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                                    Community safety "comes in many forms," notes  WalletHub —from avoiding mass shootings, natural disasters, and car accidents, to having health insurance, financial security, and avoiding eyebrow-raising websites. WalletHub looked at more than 180 of the nation's largest cities to see which ones are safest, using more...