The Center for Systems Science and Engineering at Johns Hopkins University has an interactive map showing the number of cases by country.
Centers for Disease Control and Prevention
The Centers for Disease Control and Prevention provides regular updates of the number of cases in each state.
European Centre for Disease Control and Prevention
The European Centre for Disease Control and Prevention, an agency of the European Union, also provides regular updates of the worldwide COVID-19 situation.
The World Health Organization also provides regular updates of the global situation.
Our World in Data, based at the University of Oxford, aims to make the best research on the world’s largest problems available and understandable. Much of their work is concerned with poverty, child mortality, and natural disasters. Recent work on COVID-19 shows data on new deaths and total number of deaths per country.
Max Roser, Hannah Ritchie and Esteban Ortiz-Ospina (2020) - "Coronavirus Disease (COVID-19) – Statistics and Research". Published online at OurWorldInData.org. Retrieved from: 'https://ourworldindata.org/coronavirus' [Online Resource]