Year - 1980
City of Clark - 1,351
Clark County - 4,894
State of South Dakota- 690,768

Year - 1990
City of Clark - 1,292
Clark County - 4,403
State of South Dakota - 696,004

Year - 2000
City of Clark - 1,285 
Clark County - 4,143
State of South Dakota - 754,844

Latest figures available.

2000 US Census Age Groups - from US Census Bureau Fast Facts for Congress

Age	Both Sexes	Male	Female	Both Sexes	Male	Female
Total Population	4,143	2,044	2,099	100%	100%	100%
Under 5 Years	225	111	114	5.4%	5.4%	5.4%
5 to 9 Years	276	142	134	6.7%	6.9%	6.4%
10 to 14 Years	353	174	179	8.5%	8.5%	8.5%
15 to 19 Years	359	180	179	8.7%	8.8%	8.5%
20 to 24 Years	145	71	74	3.5%	3.5%	3.5%
25 to 29 Years	150	80	70	3.6%	3.9%	3.3%
30 to 34 Years	195	94	101	4.7%	4.6%	4.8%
35 to 39 Years	280	159	121	6.8%	7.8%	5.8%
40 to 44 Years	288	138	150	7.0%	6.8%	7.1%
45 to 49 Years	324	172	152	7.8%	8.4%	7.2%
50 to 54 Years	225	118	107	5.4%	5.8%	5.1%
55 to 59 Years	199	104	95	4.8%	5.1%	4.5%
60 to 64 Years	203	102	101	4.9%	5.0%	4.8%
65 to 69 Years	206	93	113	5.0%	4.5%	5.4%
70 to 74 Years	229	110	119	5.5%	5.4%	5.7%
75 to 79 Years	196	81	115	4.7%	4.0%	5.5%
80 to 84 Years	159	70	89	3.8%	3.4%	4.2%
85 to 89 Years	90	34	56	2.2%	1.7%	2.7%
90 Years & Over	41	11	30	1.0%	.5%	1.4%
Median Age	41.6	40.5	42.6

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