Oklahoma directory offers related link information and resource in Oklahoma such as culture, sport, society, shopping, travel, transportation, entertainment, real estate, sport, education, lodging, mortgage, history.   Submit a Site   About Oklahoma Home > About Oklahoma Capital City: Oklahoma City Economy: Agriculture, petroleum, tourism, mining. Passport/Visa U.S.: Canadians need to show proof of citizenship accompanied by a photo ID (we recommend a passport). Reconfirm travel document requirements with your carrier prior to departure. Population: 3,358,045 Religion: Christian (Protestant, Roman Catholic), though other religions are represented. Time Zone: 6 hours behind Greenwich Mean Time (-6 GMT). Daylight Saving Time is observed from the first Sunday in April until the last Sunday in October Voltage Requirements: 110 volts Home | About Us | Submit a Site | Link to Us | Contact us | Disclaimer | Privacy Policy Information contained herein is deemed accurate and correct, but no warranty is implied or given. © Copyright GreatOklahoma.com, Inc., 2004. All rights reserved. Oklahoma local directory covers related link and resource to Oklahoma business such as beauty, entertainment, transportation, finance, culture, travel, art, real estate, event, sport and more.