The answer to this question depends on a few other factors. Tarawa lasted 76 hours, start to finish. 724 Navy and 950 Marines died directly, with another 3 Navy and 34 Marines dying of wounds later. Iwo Jima lasted 38 days, with 934 Navy and 4907 Marines killed outright, and another 48 Navy and 614 Marines dying of wounds later. Source: US Navy Bureau of Medicine, History of the Medical Dept in WWII Vol 3. Ground casualties at Omaha on the first day come in at around 1500 dead, most suffered by the US 1st and US 29th Divisions. The airborne operations behind Omaha were very costly as well, but the 238 reported Airborne deaths are not broken out to detail which beach was supported. Source: http://www.ddaymuseum.co.uk/faq.htm It's important to note that only deaths have been factored in here. The term casualty normally includes wounded. The data is available but not necessarily enlightening. An infantryman wounded on Omaha who is killed breaking out of St. Lo fits which category? Over time, it's possible that Monte Cassino (in Italy) or the Huergen Forest (in Germany) produced more casualties than the battles you mentioned.
Tarawa was one of the bloodiest battles of world war two but is rarely talked about. The United States Marine Corps and Army were victorious over the Japanese but casualties on both sides were heavy. There isn't enough space here to really get into the details of the battle but if you google battle of tarawa you will find a great deal of information on it.
Battle of Tarawa happened in 1943.
The duration of Tarawa Beachhead is 1.28 hours.
The duration of With the Marines at Tarawa is 1080.0 seconds.
Tarawa Island, part of the Gilbert Islands in the Central Pacific.
Tarawa Beachhead was created on 1958-11-02.
With the Marines at Tarawa was created on 1944-03-02.
Tarawa is the capital of the Republic of Kiribati, a country in the central Pacific Ocean.
Tarawa Beachhead - 1958 is rated/received certificates of: Finland:K-16
The two battles involved overwhelming the defenders . These two battle were alike in that both produced high casualties and the defenders were both members of the Axis who were defeated by members of the Allies .