The 2013 Annual Report and update for 2012 numbers are scheduled for release in early March 2013.

World's 25 Tallest Cities								World's 25 Tallest Cities								World's 25 Tallest Cities
				Rank for each past year is as of December 31.
Rank 2011		CAHTT*	Tier	Rank 2010		CAHTT*	Tier	Rank 2009		CAHTT*	Tier	Rank 2008		CAHTT*	Tier	Rank 2007		CAHTT*	Tier
1	Dubai	1176.1	1A	1	Dubai	1133.9	1A		New York City**	1043.7			New York City**	1023.3			New York City**	1023.3
2	Hong Kong	1080.9	1A	2	Hong Kong	1080.9	1A	1	Chicago	1036.5	1A	1	Hong Kong***	1006.2	1A	1	Chicago	995.1	1A
	New York City**	1045.9			New York City**	1043.7		2	Hong Kong	1006.2	1A	2	Chicago	995.1	1A	2	Hong Kong	985.7	1A
3	Chicago	1036.5	1A	3	Chicago	1036.5	1A	3	Shanghai	988.8	1A	3	Shanghai	984.5	1A	3	New York City	912.1	1B
4	Shanghai	1010.3	1A	4	Shanghai	1005.6	1A	4	Dubai	935.0	1B	4	New York City	912.1	1B	4	Shanghai	898.3	1B
5	Guangzhou	945.7	1B	5	New York City	934.3	1B	5	New York City	934.3	1B	5	Dubai	907.0	1B	5	Kuala Lumpur	896.0	1B
6	New York City	940.8	1B	6	Guangzhou	906.2	1B	6	Kuala Lumpur	897.5	1B	6	Kuala Lumpur	897.5	1B	6	Dubai	871.7	1B
7	Shenzhen	907.1	1B	7	Kuala Lumpur	897.5	1B	7	Singapore	812.9	2	7	Houston	809.8	2	7	Houston	809.8	2
8	Kuala Lumpur	897.7	1B	8	Shenzhen	838.2	2	8	Houston	809.8	2	8	Shenzhen	806.0	2	8	Shenzhen	803.7	2
9	Singapore	835.8	2	9	Singapore	829.9	2	9	Shenzhen	806.0	2	9	Singapore	790.3	2	9	Singapore	790.3	2
10	Busan	834.5	2	10	Houston	809.8	2	10	Toronto	797.0	2	10	Toronto	781.1	2	10	Toronto	781.1	2
11	Abu Dhabi	833.3	2	11	Toronto	798.0	2	11	Tokyo	774.3	2	11	Tokyo	774.3	2	11	Tokyo	774.3	2
12	Houston	809.8	2	12	Tokyo	774.3	2	12	Los Angeles	767.1	2	12	Los Angeles	767.1	2	12	Los Angeles	767.1	2
13	Toronto	806.8	2	13	Los Angeles	767.1	2	13	Guangzhou	762.2	2	13	Guangzhou	760.1	2	13	Guangzhou	760.1	2
14	Moscow	778.5	2	14	Seoul	752.0	2	14	Seoul	752.0	2	14	Seoul	752.0	2	14	Seoul	752.0	2
15	Tokyo	774.3	2	15	Moscow	747.8	2	15	Atlanta	747.2	2	15	Atlanta	747.2	2	15	Atlanta	741.4	2
16	Panama City	770.5	2	16	Atlanta	747.2	2	16	Bangkok	742.9	2	16	Melbourne	734.1	2	16	Melbourne	734.1	2
17	Los Angeles	767.1	2	17	Bangkok	744.1	2	17	Melbourne	734.1	2	17	Bangkok	731.2	2	17	Dallas	717.3	2
18	Seoul	752.0	2	18	Chongqing	742.4	2	18	Beijing	718.6	3	18	Dallas	717.3	3	18	Bangkok	716.5	2
19	Kuwait City	750.5	2	19	Melbourne	734.1	2	19	Dallas	717.3	3	19	Sydney	711.9	3	19	Sydney	711.9	2
20	Doha	748.9	2	20	Beijing	718.6	3	20	Sydney	711.9	3	20	Philadelphia	701.8	3	20	Chongqing	689.4	3
21	Chongqing	748.2	2	21	Dallas	717.3	3	21	Chongqing	709.9	3	21	Chongqing	692.6	3	21	Wuhan	685.1	3
22	Atlanta	747.2	2	22	Sydney	711.9	3	22	Philadelphia	703.6	3	22	Wuhan	685.1	3	22	Seattle	670.4	3
23	Bangkok	744.1	2	23	Philadelphia	703.6	3	23	Wuhan	685.1	3	23	Seattle	670.4	3	23	Moscow	664.6	3
24	Melbourne	734.1	2	24	Wuhan	685.1	3	24	Manila	678.2	3	24	Moscow	666.0	3	24	Manila	656.9	3
25	Beijing	718.6	3	25	Manila	678.2	3	25	Seattle	670.4	3	25	Miami	660.2	3	25	Philadelphia	654.1	3
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World's 25 Tallest Cities								World's 25 Tallest Cities
Rank for each past year is as of December 31.
Rank 2006		CAHTT*	Tier	Rank 2005		CAHTT*	Tier	Rank 2004		CAHTT*	Tier	Rank 2000		CAHTT*	Tier
	New York City**	1015.5			New York City**	1015.5			New York City**	1015.5		1	New York City	1010.4	1A
1	Chicago	995.1	1A	1	Chicago	995.1	1A	1	Chicago	995.1	1A	2	Chicago	995.1	1A
2	Hong Kong	955.5	1A	2	Hong Kong	955.5	1A	2	Hong Kong	955.5	1A	3	Kuala Lumpur	852.1	1B
3	New York City	904.3	1B	3	New York City	904.3	1B	3	New York City	903.8	1B	4	Hong Kong	839.6	1B
4	Shanghai	898.3	1B	4	Kuala Lumpur	896.0	1B	4	Kuala Lumpur	896.0	1B	5	Houston	809.8	1B
5	Kuala Lumpur	896.0	1B	5	Shanghai	894.0	1B	5	Shanghai	863.2	1B	6	Toronto	776.3	2
6	Dubai	822.1	2	6	Houston	809.8	2	6	Houston	809.8	2	7	Singapore	772.3	2
7	Houston	809.8	2	7	Shenzhen	798.9	2	7	Shenzhen	793.5	2	8	Los Angeles	767.1	2
8	Shenzhen	803.7	2	8	Toronto	781.1	2	8	Toronto	776.4	2	9	Tokyo	754.3	2
9	Singapore	790.3	2	9	Singapore	772.3	2	9	Singapore	772.3	2	10	Shanghai	747.1	2
10	Toronto	781.1	2	10	Dubai	772.1	2	10	Los Angeles	767.1	2	11	Atlanta	732.0	2
11	Los Angeles	767.1	2	11	Los Angeles	767.1	2	11	Tokyo	764.8	2	12	Dallas	717.3	2
12	Tokyo	764.8	2	12	Tokyo	764.8	2	12	Seoul	752.0	2	13	Shenzhen	715.6	2
13	Seoul	752.0	2	13	Seoul	752.0	2	13	Atlanta	732.0	2	14	Melbourne	685.5	3
14	Atlanta	741.4	2	14	Atlanta	732.0	2	14	Dubai	722.8	2	15	Sydney	674.3	3
15	Melbourne	734.1	2	15	Dallas	717.3	2	15	Dallas	717.3	2	16	Bangkok	674.0	3
16	Dallas	717.3	2	16	Sydney	711.9	2	16	Sydney	706.3	2	17	Seattle	663.5	3
17	Bangkok	714.1	2	17	Bangkok	710.3	2	17	Bangkok	704.3	2	18	Philadelphia	653.5	3
18	Sydney	711.9	2	18	Melbourne	697.3	3	18	Guangzhou	688.3	3	19	Frankfurt	645.1	3
19	Guangzhou	701.4	2	19	Guangzhou	688.3	3	19	Melbourne	685.5	3	20	San Francisco	636.6	3
20	Chongqing	671.7	3	20	Seattle	663.5	3	20	Seattle	663.5	3	21	Guangzhou	627.9	3
21	Seattle	670.4	3	21	Chongqing	663.3	3	21	Manila	656.9	3	22	Manila	627.5	3
22	Manila	656.9	3	22	Manila	656.9	3	22	Philadelphia	654.1	3	23	Minneapolis	616.5	3
23	Philadelphia	654.1	3	23	Philadelphia	654.1	3	23	Frankfurt	645.1	3	24	Boston	611.6	3
24	Frankfurt	647.6	3	24	Frankfurt	647.6	3	24	San Francisco	636.6	3	25	Seoul	610.5	3
25	San Francisco	636.6	3	25	San Francisco	636.6	3	25	Minneapolis	618.2	3
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*The CAHTT is the “Calculated Average Height of the Ten Tallest” buildings and towers of each city. For each past year, the numbers are as of December 31. The formula gives less weight for thin, ornamental spires and observation towers, and ignores the number floors, which is a poor indicator of actual height. Antennas are not counted as part of a buildings height, following the guidelines of the Council on Tall Buildings and Urban Habitat (CTBUH). Buildings are not included in end-of-year rankings if not determined completed by the standards set by the CTBUH. For details of the formula please see the Methodology page. See also Ten Tallest Cities, and The Rise and Fall of the American Skyscraper.

**The score for New York City 9/10 is what it would have been for New York, had the World Trade Center Towers not been destroyed. This ranking of New York 9/10 was set to end when the first city exceeded its CAHTT score, or after ten years, whichever occurred later. On January 4, 2010, Dubai exceeded New York 9/10’s score. Therefore, ranking of New York City 9/10 (in purple above) will end with the 2011 rankings.

***Hong Kong was the first metropolis to exceed a CAHTT score of 1000 since New York (which attained a score of 1009.9 in 1977), and the second one to replace Chicago as the world’s tallest (New York City was the first in 1890). However, its reign as the world’s tallest city was short-lived, with the completion of the Trump International Hotel & Tower in May 2009, when Chicago briefly regained its position as the world’s tallest city before it was surpassed a third time, this time by Dubai.

****Dubai experienced a meteoric rise in this annual ranking, with an ambitious construction boom not seen since the 1920’s and 1930’s in New York City. Dubai purposefully sought to be number one several years ago, and finally achieved this with the completion of what is now by far the world’s tallest building. The 162-story Dubai Tower, now called Khalifa Tower (Burj Khalifa), was officially opened on January 4, of 2010. See our World’s Tallest City page for more on Dubai.

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