AFF Table

Subject	Percent of households	MOE	Percent of families	MOE	Percent of married-couple families	MOE	Percent of nonfamily households	MOE
Total	4,817,757	+/-45100	3,216,764	+/-41114	2,448,014	+/-41010	1,600,993	+/-29632
Less than $10,000	9.0	+/-0.5	5.0	+/-0.5	1.8	+/-0.3	18.0	+/-1.0
$10,000 to $14,999	7.1	+/-0.3	3.7	+/-0.3	2.1	+/-0.2	14.4	+/-0.9
$15,000 to $24,999	12.7	+/-0.4	9.7	+/-0.5	7.4	+/-0.4	19.3	+/-0.9
$25,000 to $34,999	12.3	+/-0.5	11.4	+/-0.5	9.8	+/-0.5	14.7	+/-0.9
$35,000 to $49,999	15.5	+/-0.5	16.0	+/-0.6	15.7	+/-0.6	13.5	+/-0.7
$50,000 to $74,999	19.2	+/-0.5	22.6	+/-0.7	25.1	+/-0.9	11.6	+/-0.7
$75,000 to $99,999	10.7	+/-0.4	13.6	+/-0.6	16.1	+/-0.7	4.4	+/-0.5
$100,000 to $149,999	8.7	+/-0.4	11.4	+/-0.5	14.1	+/-0.7	2.7	+/-0.4
$150,000 to $199,999	2.5	+/-0.2	3.4	+/-0.3	4.2	+/-0.3	0.7	+/-0.2
$200,000 or more	2.3	+/-0.2	3.0	+/-0.3	3.9	+/-0.3	0.8	+/-0.2

Median income (dollars)	42,941	+/-606	53,680	+/-983	62,101	+/-824	23,958	+/-923

Mean income (dollars)	57,157	+/-913	67,851	+/-1136	77,508	+/-1407	33,734	+/-1000

PERCENT IMPUTED
Household income in the past 12 months	26.0	(X)	(X)	(X)	(X)	(X)	(X)	(X)
Family income in the past 12 months	(X)	(X)	25.9	(X)	(X)	(X)	(X)	(X)
Nonfamily income in the past 12 months	(X)	(X)	(X)	(X)	(X)	(X)	25.2	(X)

Source: U.S. Census Bureau, 2004 American Community Survey

Data are based on a sample and are subject to sampling variability. The degree of uncertainty for an estimate arising from sampling variability is represented through the use of a margin of error. The value shown here is the 90 percent margin of error. The margin of error can be interpreted roughly as providing a 90 percent probability that the interval defined by the estimate minus the margin of error and the estimate plus the margin of error (the lower and upper confidence bounds) contains the true value. In addition to sampling variability, the ACS estimates are subject to nonsampling error (for a discussion of nonsampling variability, see Accuracy of the Data). The effect of nonsampling error is not represented in these tables.

Explanation of Symbols:

1. An '*' entry in the margin of error column indicates that too few sample observations were available to compute a standard error and thus the margin of error. A statistical test is not appropriate.

2. An '**' entry in the margin of error column indicates that no sample observations were available to compute a standard error and thus the margin of error. A statistical test is not appropriate.

3. An '-' entry in the estimate column indicates that no sample observations were available to compute an estimate, or a ratio of medians cannot be calculated because one or both of the median estimates falls in the lowest interval or upper interval of an open-ended distribution.

4. An '-' following a median estimate means the median falls in the lowest interval of an open-ended distribution.

5. An '+' following a median estimate means the median falls in the upper interval of an open-ended distribution.

6. An '***' entry in the margin of error column indicates that the median falls in the lowest interval or upper interval of an open-ended distribution. A statistical test is not appropriate.

7. An '*****' entry in the margin of error column indicates that the estimate is controlled. A statistical test for sampling variability is not appropriate.

8. An 'N' entry in the estimate and margin of error columns indicates that data for this geographic area cannot be displayed because the number of sample cases is too small.

9. An '(X)' means that the estimate is not applicable or not available.

Prepared By: The Pennsylvania State Data Center 02/1/2006